How to replace the absorber in a VAZ 2112 with your own hands

The VAZ 2112 absorber looks like this

The VAZ 21124 absorber is installed on all cars manufactured in accordance with Euro-3 environmental standards; according to this standard, gasoline vapors are not emitted into the atmosphere, but are retained. To meet these requirements, an absorber is additionally built into the vehicle’s fuel system. The absorber for the VAZ 21124 is connected to the fuel system, traps gasoline vapors, thereby preventing their release into the environment, let’s consider what kind of unit it is and the principle of operation.

Causes of car adsorber malfunction

If you do not take into account the service life of the adsorber and the associated contamination of activated carbon, there are only two most common causes of problems with this unit:

Violation of the tightness of the valve with simultaneous clogging of the tube connecting the adsorber to the atmosphere. In this case, it is impossible to start the engine the first time - this is due to the over-enrichment of the mixture with gasoline vapors entering the manifold through a faulty valve.
Clogging of the tube communicating with the atmosphere when the valve is in normal condition. In this case, the engine starts normally, but as soon as it warms up and the canister valve opens, vapors rush into the manifold under high pressure, instantly re-enriching the mixture, which leads to the engine stalling. When restarted, when the excess vapor pressure in the fuel system has been eliminated, it operates normally.

Thus, it becomes clear why an adsorber is needed in a car, and what important role it plays for the normal operation of the engine. The faulty unit can be replaced with a new one, or you can try and repair it. How to do this is shown in the video:

What is a VAZ 2114 adsorber and for what purpose is it installed on a car? And it’s worth remembering such a thing as European standards for car toxicity. Every year they become stricter; only those cars that emit a permissible amount of harmful substances into the atmosphere are put on the road. Someone will say that Europe is small, and it really needs this so as not to suffocate in the smog (and in England there has always been smog without cars). But for the Russian Federation this is irrelevant - a large territory and a huge number of forests that require carbon dioxide to live.

But in order to supply cars to other countries, they have to be improved and adjusted to standards, including environmental ones. And immediately you need to highlight two main points:

An absorber is a substance that absorbs vapors. In this case we are dealing with activated carbon. It is also used in gas masks.
An adsorber is a device in which the vapor absorption process takes place.

This, in general terms, applies specifically to cars. In fact, absorbers can be of several types, just like adsorbers. But if you need it, consult your chemistry textbooks.

Absorber in VAZ 2112: device and purpose

The VAZ 2112 absorber looks like this

Adsorber VAZ 2112 16 valves signs of malfunction

It seemed like such an inconspicuous element, which at first glance is not important for the car, but without which it cannot work properly. Dips appear, the engine “troubles” and the gas tank may even collapse! And all this is due to a faulty adsorber valve

Many people don’t know what it is, how it works and MOST IMPORTANTLY what it affects. Today I will try to put everything into simple terms, and also describe the main symptoms of a malfunction

It will definitely be useful, so read and watch...

First, let's start with a definition.

An adsorber (from Latin sorbeo - absorb) is a car system that serves to capture gasoline vapors that come out of the tank. When the engine is running, they are sent to the fuel injection system, namely to the intake manifold. When the engine is turned off, some of the vapors are captured by the separator (it directs them back to the tank), and the remaining vapors enter the adsorber, where they are neutralized.

Adsorber VAZ-2114: design review, features and causes of malfunction

Signs of a malfunction of the control unit

First, start the engine: at idle or in cold weather, you will hear a characteristic, barely audible chirping sound. It indicates that the valve is working properly. In order not to confuse this sound with the noise from a working timing belt, sharply press the gas. The character of the chatter should not change. The following signs indicate a malfunction of the control unit:

lighting of the CHECK signal on the instrument panel;
determination of error PO441 during testing;
increased gasoline consumption;
unstable operation of the power unit when driving;
unstable idle;
increase in CO2 content;
a hissing sound when unscrewing the tank lid (a vacuum has appeared);
the appearance of a fuel smell in the cabin.

Design and operation of the adsorber purge valve

The KPA is an electromagnetic locking device that operates from the vehicle’s on-board network. The valve consists of:

plastic case;
valve with spring;
windings;
metal core;
connector

When the vehicle's engine is turned off, no voltage is supplied to the valve and it remains in the closed position. That is, on the motor side, the system that captures vapors is blocked. At the same time, the adsorber begins to “collect” vapors. When the power unit starts, voltage is applied to the valve, causing it to open and fuel vapors to enter the intake manifold. As soon as the ignition is turned off, the control unit is de-energized and the pipeline is closed: no vapors enter the receiver.

Cars of a high price category have a more complex evaporation system. Such machines have special sensors that can “calculate” the amount of air and vapor as a percentage. This allows you to more accurately control the supply of gasoline to the injector.

And now in more detail

How can I check the functionality of this device? The fundamental element in the absorber is the valve. To understand the function, let’s look at how the adsorber works. When a car is parked, a huge amount of gasoline vapor can accumulate in its tank. Some of the vapor is caught by the recuperator, and the rest settles back into the tank. The part that was caught goes into the adsorber. When the engine is running, the absorber valve closes and interrupts the access of vapors, now they are sent to the combustion chamber. What is it for? When you start the car, our device prevents vapors from entering the exhaust manifold, thereby reducing the amount of harmful substances in the gas.

Installing a new adsorber valve

To replace an element, it is not necessary to contact a car service. You can do the work yourself using several Phillips screwdrivers. You also need to purchase a new valve (its markings must completely match the data on the old device).

We find the adsorber.
Remove the negative terminal from the battery.
Disconnect the wire block by pressing the latch and pulling the device towards you.
We loosen the fastenings of the solenoid valve and disconnect the hoses.
We take out the old device (the bracket will come out along with it) from the absorber.
We install the new device and put everything back together in reverse order.

Removing the absorber

The unit is located in the front right compartment of the engine compartment, removal begins with:

Disconnecting the adsorber connector
Then we loosen the two clamps with a Phillips screwdriver and remove the outlet and inlet hoses, which have different diameters

Loosen the clamps and remove the pipes (hoses)

Take the “10” key and loosen the bolt that tightens the clamp, then remove the adsorber
Now you can install the new unit in reverse order

We remove the unit after loosening the tightening clamp

The independent replacement is completed, all you have to do is watch the video and get to work, there is nothing difficult about replacing, just decide for yourself whether the environment is important to you or not.

Source

Purge valve failure

The valve operates on the principle of electromagnetic induction.
A faulty shut-off valve, as it can also be called, makes clicking and hissing sounds when it releases unrefined vapors from the gas tank. The machine panel display includes a breakdown signal; the diagnostics carried out will accurately show the fault. Reasons for malfunction:

the winding is short-circuited;
wires are broken;
mechanical damage.

A faulty adsorber part cannot be repaired; it only needs to be replaced. You can do this simple procedure yourself. In the latest Priora models it is located under the engine cover, and removing it is not difficult.

disconnect the wiring;
soften the pipe with hot water;
remove and replace the valve;
again use boiling water and clamp the soft tube, you can use a clamp.

cut the hose along the edge of the part;
install a new lock;
heat the pipe and put it in place.

Don’t forget to attach the adsorber to its original position and flash the electronic control unit.

Disadvantages of the device

Despite the fact that the absorber has on board almost every car sold on the market, this does not mean at all that it is without disadvantages:

The dimensions of the device are quite significant, which is why it occupies quite a large usable space in the front of the machine;
Significantly expensive installation. Installing this device on an old car is quite an expensive pleasure, which is unlikely to be offset by some fuel savings. All vehicles coming off the assembly line include an absorber fee as a markup on the cost.
There is a widespread opinion among car enthusiasts that the device “strangles” internal combustion engines and significantly reduces the dynamics of the car. Also, the speed and response time of the gas pedal allegedly drop. All this, however, does not find any confirmation in modern research.
In the event of a breakdown, the driver should urgently go to the nearest technical center, otherwise a broken absorber will cause a lot of trouble. The least you will have to deal with is a drop in engine power. In advanced cases, the fuel pump breaks down. In addition, there are known cases of accidents caused by a gas tank cap flying off at high speed under vapor pressure.

Removal and inspection

2. Having released the latch, disconnect the wiring harness block from the canister purge valve.

How to properly clean the adsorber in a car?

3. Connect the negative voltage probe (to the car body).

4. Turning on the ignition, use a voltmeter to measure the supply voltage at terminal A of the wiring harness block (the pins are marked on the block).

Comment. The voltage at the terminal must be at least 12 V. If the voltage does not flow to the block or it is less than 12 V, it means that the battery is discharged, the power circuit is faulty, or the ECU is faulty.

5. Use a Phillips screwdriver to loosen the clamp securing the hose to the canister purge valve.

6. Remove the hose from the valve nozzle.

Advice. If the hose on the nozzle is seated tightly and cannot be disconnected, then you can remove the valve from the adsorber and, by rotating the valve, remove the hose from it.

7. Using a screwdriver, remove the valve from the adsorber.

8. We apply 12 V voltage from the battery to the valve terminals (“+” to terminal A, “-” to terminal B).

Comment. When voltage is applied to the terminals, the valve should open with a characteristic click. The faulty valve must be replaced.

The smell of gasoline in the interior of a VAZ 2107, possible causes of the malfunction, solutions

Operating principle

When the fuel is heated in the engine, the same hydrocarbon vapors appear, which, according to the laws of physics, rise upward into the separator, where most of them condense (return to a liquid state and flow back into the fuel tank, i.e., fuel savings occur). Residual gases are transferred through a steam line to an adsorber filled with activated carbon, which neutralizes them.

While the engine is running, there is another option for getting rid of harmful vapors - by redirecting them from the intake pipe. The temperature there is quite high, and the gas simply burns.

The adsorber is located under the hood, in the VAZ 2110 - in the near left corner. The adsorber looks like a small cylinder with a lid.

Adsorber design

separator;
gasoline drain pipe;
steam outlet tube and hose;
purge valve;
gravity valve;
adsorber

Brief information

Adsorption is the process of absorption of one substance (more rarefied) by another (more dense)

. In this case, the transformation of one chemical substance into another does not occur. This principle finds application in various spheres of human life - from medicine to industry.

The following are used as absorbent substances:

A carbon-containing substance of organic origin that has pores;
Dried gel;
Calcium and sodium aluminosilicates;
Various minerals found in the natural environment.

Starting from the second generation of the Euro series environmental standard, all manufactured cars must have a special capacity to absorb gasoline or diesel fumes. European manufacturers who flout these rules are fined. Foreign violating factories are losing the European market.

The absorber is a small cylindrical container located under the hood of the car in close proximity to the engine.

Car enthusiasts often make a mistake in spelling the word “adsorber”

, replacing the letter “d” with “b”.
The erroneous option is very common, but adsorber is still normative .

Useful video

You can get additional information about the design of the adsorber and options for replacing it from the video below:

Here's some interesting information I found about the adsorber, it's scary: Due to the fight for the environment, the used tank has no outlet to the atmosphere. Gasoline vapors go through the pipeline to the carbon adsorber-receiver, and from it through the valve they enter the inlet manifold, participate in the mixture formation process, and then, of course, are burned. During parking, the valve is closed and vapors accumulate in the receiver. After starting the engine, it begins to open with impulses from the control unit.

The moment the system starts to operate may differ for different engines - for some the valve begins to open immediately, for others there is some time delay relative to the moment the engine starts. First you need to check whether there are control pulses to the valve. You can check by the sound (clicking) of the valve or by checking for the presence of control pulses on it. If the voltage at the connector is about 4 when the engine is running.

5 volts - pulses are coming (the voltmeter integrates rectangular 12V pulses). Next, turn off the engine, disconnect the tube that goes from the valve to the adsorber and, for convenience, put a suitable tube on the valve fitting instead. Blow into it in the valve-manifold direction. There must be an obstruction. Remove the connector from the valve, apply 12V to it and blow again.

The valve should now flow. So the adsorber-black can is installed under the air intake, in the right wing, has a diameter of 6 cm, a length of about 20 cm. Two hoses go from above, one goes into the gas tank, the other through the valve into the injection (or carburetor), from below through a 3 cm tube is connected with atmosphere. The task is to protect the environment; it accumulates gasoline vapors and then they are sucked off by the engine. If it fails, although there is nothing to break in it, so it is more correct that if it becomes clogged, the consequences for the machine can be catastrophic.

Consequences: 1) When clogged, the engine begins to suck all the air from the gas tank, as a result of which the tank is flattened with terrible force, and there is a gasoline pump in it, and so the gasoline pump is flattened by the tank with the same force, which threatens its breakdown 2) When the adsorber is completely filled with gasoline that has been sucked out from the tank, this gasoline begins to flow directly into the intake manifold and naturally into the cylinders and into the exhaust manifold. If a large amount of gasoline gets into the cylinders while the engine is running, there is a risk of damage to the cylinder head, pistons, etc., etc.

K. Gasoline is still an incompressible liquid. Getting gasoline into the exhaust manifold can lead to failure of the lambda and fusion of the catalyst. These are the consequences that can arise due to a seemingly insignificant detail. Periodically, after the engine warms up to more than 60 degrees, the engine idle speed begins to drop. While driving, the car periodically starts to stall for no apparent reason (like 2 min.

I'm dumb for 10 minutes. I fly). Diagnostics produces errors such as: the adaptation limit has been exceeded or the mixture control is outside the permissible limits. The situation becomes aggravated in wet weather or if the right wheel drives into a puddle. If the above symptoms are observed, it is worth checking the adsorber.

You can do this: disconnect the hose going from the valve to the manifold and plug it and drive for 5 days, if the symptoms disappear, then the adsorber is clogged. After the engine is turned off, liquid is observed to flow through the hose from the adsorber to the gas tank. When you unscrew the gas tank cap, you can hear air starting to be sucked into the tank. When driving, the gasoline reading level begins to drop sharply.

After filling the tank with gas, the car stalls. If the above symptoms are observed, then the adsorber is completely clogged! Further movement is only possible with the tank cap unscrewed, and it is better to disconnect the hose going from the valve to the manifold and plug it, otherwise you will face the above consequences. If your car is more than 10 years old (of course, depends on operating conditions), or more than 5 years old but you drive on dusty country roads, I strongly recommend cleaning the adsorber. from the forum https://www. Forum. Skoda-club.

Ru/viewtopic. Php? t=4900Taken from: https://2114.ru.

Why is an absorber needed in a car?

Adsorption of fuel vapor occurs in every modern car model. Thanks to this technology, it is possible to achieve the following goals:

Significant gasoline savings. Thanks to the design of the absorber, part of the fuel gases that have managed to condense flow back into the gas tank.
The occupants of the car interior will no longer be bothered by the unpleasant odor that occurred in many older models.
The gas tank cap is now much easier to open. Even in the generations before last, in hot weather the pressure in the tank increased so much that it was physically difficult to open the fuel tank.
Manufacturers claim that cars with absorbers are highly environmentally friendly. Indeed, thanks to these simple devices, gases that are toxic to the atmosphere do not enter the air. Considering that there are several billion cars in the world, the environmental benefits become quite obvious.
Safety. Thanks to the operation of the vapor absorption system, it is possible to reduce (although not much) the explosion hazard of iron horses operating on liquid fuel.

Canister purge valve

I decided to call this article exactly that, although the adsorber valve itself is not the main character here. It all started when my engine fault light came on (the check engine light came on). I waited for the next maintenance (fortunately it happened shortly before the scheduled maintenance) and informed the car service employees about it. They carried out diagnostics and said that the culprit was the canister purge valve, but they did not have this valve in stock, and for now it was possible to drive as is. I must say that at that time there were two weeks left before the end of the warranty, but they swore that they would replace the valve free of charge, even if the warranty had already expired by the time the valve arrived at the warehouse.

I was happy (despite everything, I never stop believing people)))), and in the article Three years on Priora I hastened to write that the adsorber valve was replaced under warranty. However, I was in a hurry...

As you may have guessed, no one was going to change anything for me for free. After several dozen phone calls to the car service center, I came to the disappointing conclusion that I had been duped once again. There was neither time nor desire to go to court over such a trifle. And I decided to change the canister purge valve on the Priora myself. But the experience of dealing with car services still taught me something, and I decided to check whether this ill-fated valve was really the problem.

The Priora's standard computer showed error 4. This is an error in the coolant temperature sensor. Of course, this could have been an accidental mistake. I didn't have the opportunity to use another computer or connect a laptop, so I tried to determine the source of the problem based on the symptoms. And the symptoms were:

Sometimes (rarely) the engine was not very stable at idle
Fuel consumption has increased quite slightly (almost imperceptibly - pure intuition)
Sometimes a hot engine would not start the first time
The engine began to pull worse (especially at low speeds), but also not much worse

After surfing the Internet, I came to the conclusion that the malfunction was somehow related to the air. And I read in several sources that the cause of this problem may be worn out rubber bands on the exhaust manifold fittings (see Fig. 1).

Rice. 1. Canister purge valve.

For various reasons, these rubber plugs deteriorate and lose their seal. Through the formed holes (Fig. 2), air begins to be sucked in, which leads to minor disturbances in engine operation.

Rice. 2. Damaged plug.

They write on the Internet that instead of these rubber bands you can use rubber bands from the brake cylinder bleeding fittings. You can probably install other suitable rubber bands. However, I only had tape on hand. I carefully wrapped the damaged elastic band with this tape (Fig. 3).

Rice. 3. Repair the plug using tape.

And, lo and behold, the engine malfunction light went out (of course, after resetting the errors). Of course, tape is a temporary solution to the problem. Most likely, it will not withstand temperature changes, especially in winter. But I’ve already been away for several weeks and so far everything is fine.

Conclusion

: no matter how developed the diagnostic tools are, people who work with them do not always have sufficient qualifications. And it may well be that in your case, instead of purchasing a new adsorber valve for 1500...2000 rubles (or so), you will solve the problem with the help of adhesive tape and such and such)))))

Well, if you still suspect the adsorber valve, then you can check its operation using improvised means.

We disconnect the negative terminal of the battery and remove the canister purge valve, which is held on the plastic engine cover with a latch (Fig. 1). Disconnect the power supply to the valve and the air supply/exhaust hoses. Then we try to blow the valve through the holes for the hoses. A serviceable valve is closed when the power is turned off, that is, it should not be purged.

Then carefully connect two wires to the valve power connectors and connect them to the battery (polarity does not matter). The valve should click quietly, that is, open. We try to blow out the valve again, now air should pass through the valve freely, that is, when power is applied, the valve opens. Turn off the power - the valve should close again and stop blowing.

If you succeeded in all this, then the valve itself is 99.99% likely to be working. However, there remains the possibility of malfunction of the valve control circuits. But that is another story…

How the system works - operating principle

Why am I focusing on the solenoid valve, because it is practically the key one in this system. For a better understanding, I am posting a diagram of an injection car, and in this case it is a VAZ of the 10th family

For a better understanding, I am posting a diagram of an injection car, and in this case it is a VAZ of the 10th family.

So, fuel vapor rises to the top of the tank and stops at the separator, which is combined with a gravity sensor (as I wrote above, it prevents fuel from leaking out in the event of an accident - capsizing from the tank). In it they partially condense and return back (in the form of liquid fuel).

However, the other part of the evaporation, bypasses the gravity valve, passes into the adsorber, where they actually accumulate

Accumulation occurs when the engine is not running! IT IS IMPORTANT

After starting the engine, the solenoid valve opens - thereby connecting the adsorber cavity (where the gases are trapped, as it were) with the intake manifold or throttle assembly (in different cars in different ways). THE PROCESS OF THE SO-CALLED PURGE BEGIN! The vapors are mixed with air (from the street), which is supplied through the throttle assembly, then enter the intake manifold and then into the engine cylinders, where they are burned with the air-fuel mixture.

The system is very simple if you understand how it works.

Absorber device

Many VAZ 2112 owners have no idea what an absorber is, let's figure it out, starting with the name:

Absorption is the phenomenon of absorption of gases by solid or liquid substances. In our case with an automobile system, coal acts as an absorbent, and the absorber is filled with this coal (the same principle is used in a gas mask)
Now let’s look at this unit using the example of a VAZ 2112, what is an absorber, with an injection-type engine
The feedback injection system uses a system to capture fuel vapors
Such a system includes an adsorber, which is installed in the engine compartment, valves, a separator, as well as connecting hoses.
In such a system, fuel vapors generated in the tank are partially condensed inside the separator, and the condensate is drained into the tank
Non-condensed vapors are released through a two-way and gravity valve
The gravity valve is used to prevent gasoline from leaking out of the tank if the car suddenly rolls over, and a two-way valve is necessary to prevent excessive pressure or strong vacuum from occurring inside the fuel tank
After this, gasoline vapors enter the adsorber, where they are absorbed by activated carbon
A hose goes from the second fitting of the adsorber to the throttle assembly, and from the third the hose is connected to the atmosphere through a solenoid valve
Usually, when the engine is stopped, the third fitting is always closed using an electromagnetic valve; it turns out that the adsorber does not communicate with the atmosphere
And when the engine starts, the controller in the injection system supplies control pulses to the valve with a frequency of about 16 Hz
Then the valve opens and its sorbent (coal) is purged through the cavity of the adsorber - gasoline vapors enter the receiver through the hose along with air
The higher the air consumption of the motor, the longer the pulse duration and the more intense the purging.
If the injection system operates without feedback, then the gasoline vapor recovery system consists only of a separator with a two-way check valve
The air filter is located in the left front section of the engine compartment and is secured with three rubber holders - supports
The filter contains a paper element; when changing it, the corrugations must be positioned parallel to the axis of the machine
The air passes through the filter to the air flow sensor, then passes through the intake hose to the throttle body
The throttle assembly itself is mounted on the receiver
When you press the gas pedal, the owner slightly opens the throttle valve, thereby changing the volume of air entering the engine, and accordingly, the combustible mixture, since the supply of gasoline is calculated by its controller strictly depending on the air consumed

Operating principle and design of the adsorber

The plastic body of the assembly contains a filler, simply activated carbon or a more complex substance. It is required to have high porosity and the ability to adsorb gasoline vapors, that is, to retain them in itself, separating them from the air.

The housing is sealed, on top there are inlet and outlet plastic fittings, usually for quick-release connectors, and there is also an integrated mount for an electric purge valve with its own connector.

While the engine is running, the pressure in the car's tank changes. In those days when they did not care about the environment, the problem was solved by a simple drainage hole in its plug.

Now, when ventilating the tank, it is necessary to separate hydrocarbons, that is, gasoline vapors from atmospheric air. To do this, an outlet is made from the top of the tank, connected by a hose through a separator and a system of safety valves to the internal space of the adsorber.

Gasoline vapors passing through activated carbon are separated and retained by its porous structure, which is very similar to the principle of operation of a gas mask.

The air passes further into the atmosphere through the breather fitting of the adsorber. At high temperatures and intensive use, the device’s capacity will quickly be exhausted, and gasoline will have to be removed somewhere.

For this purpose, the automatic operation of a car engine provides a special mode for purging the adsorber through the corresponding valve, which is connected by a hose to the throttle space of the intake tract. Usually directly to the intake manifold. Purge occurs due to the vacuum present there.

Certain conditions must be met for the electronic engine control unit (ECU) to issue a purge command:

the engine should not be idling, which is determined by the speed and the pressure of the accelerator pedal;
the temperature of the coolant and outside air are within the ranges specified by the program;
The crankshaft rotation speed and engine air consumption determine the rate at which the adsorber is purged.

The purge flow is regulated in a key mode, that is, the valve opens and closes with a certain frequency, and the time of its relative stay in the closed and open states determines the performance of the mode.

It should not affect the main tasks of the motor - smooth traction, high output and stable operation.

Adsorber. Why is it needed, how does it work, how to check.

During purging, air is taken through the breather fitting of the adsorber, passes through the absorbent filling under the influence of a pressure difference, is saturated with gasoline vapor and is sent to the intake manifold for combustion in the cylinders as part of the air-fuel mixture.

The device is prepared to receive the next portions of vapor from the gas tank.

Detailed diagram of the fuel system

Detailed diagram of the fuel system.

1 — nozzles; 2 — fitting plug for monitoring fuel pressure; 3 — injector ramp; 4 — bracket for fastening fuel pipes; 5 — fuel pressure regulator; 6 — adsorber with solenoid valve; 7 — hose for suction of gasoline vapors from the adsorber; 8 — throttle assembly; 9 - two-way valve; 10 - gravity valve; 11 - safety valve; 12 - separator; 13 — separator hose; 14 — fuel tank plug; 15 - filling pipe; 16 — filling pipe hose; 17 — fuel filter; 18 — fuel tank; 19 — electric fuel pump; 20 — fuel drain line; 21 - fuel supply line.

Below we will look at the main elements of the fuel system separately.

Fuel tank

Dismantled VAZ-2112 gas tank.

The filled gasoline is supplied from the tank, which is located in the rear of the car, in the area where the sofa is located . The tank is made of steel and assembled by welding two stamped parts. Gasoline is supplied to the tank through a special neck, from a gas-resistant hose made of rubber, secured together with clamps.

Gasoline pump

Fuel pump VAZ-2112 1139009

A gas pump is an electrical functional device, submersible, installed directly into the gas tank itself. This pump is started by a signal from the ECU controller, which is responsible for fuel injection, through a relay when the ignition is turned on. If the fuel pump doesn't pump, the engine won't start! The operating pressure of the pump is at least 2.8-3 bar (atmospheres - approx.). In order to get to it, just lift the rear sofa and unscrew the technical hatch.

Fine filter

The new filter is ready for installation.

From the fuel pump, through a flexible steel hose, gasoline passes under pressure to the fine filter. The filter is made of steel and cannot be disassembled. A special paper filter element is installed inside. On the housing cover there is a special arrow, created for visual indication during installation, showing the direction of movement of gasoline in the system.

Fuel rail

Through steel fuel pipes, after filtration, gasoline passes directly to the fuel rail. It is designed to transfer gasoline to atomization and is mounted on the “outlet”. On one side of the fuel rail there is an RTD, on the other there is a fitting for controlling gasoline pressure. The pressure in the ramp in operating condition should be from 2.8 to 3.2 bar ( 2.8-3.2 atmospheres - approx.) - this indicator depends on the stabilization in the receiver, indicating constant differences in them. This is necessary in order to dose the optimal amount of gasoline into the injectors.

Fuel pressure control

Be careful when dismantling.

An RTD is a special device with a valve, assembled with a special diaphragm with a spring retainer. Under the influence of this element, the working position is in the locked type. It is also designed to divide the internal space of the regulator itself into two closed cavities - air and fuel.

The cavity for air is connected to the hose and receiver, and for fuel it is connected to the structure itself on the ramp.

During operation of the motor, the vacuum overcomes the resistance created by the spring and tries to tighten the diaphragm, thereby opening the valve. And from another position, at this time, gasoline presses on the diaphragm, also influencing the spring. As a result of this action, the valve opens slightly and part of the fuel flows back into the gas tank through the fuel line.

When the gas is pressed, the vacuum behind the throttle valve (throttle valve - approx.) becomes less, and the diaphragm, under the influence of a spring, closes the valve, increasing the fuel pressure. And if it is closed, the vacuum pulls the valve as far as possible - reducing fuel pressure.

The total pressure drop in the sensor is determined by the stiffness of the spring and the size of the hole. It cannot be adjusted, it is a non-separable element, and when it fails it must be replaced.

Checking the functionality of the adsorber

To make sure that the malfunction is related specifically to the valve of this element, you can send the car for a full diagnosis. But this is expensive, so let’s first try to identify possible problems ourselves.

First of all, you need to see if the controller is generating errors, for example, “open circuit control.” If everything is fine, then it will use a manual check. To do this, just prepare a multimeter, a screwdriver and several wires. After this you need to follow a few simple steps:

Raise the hood of the car and find the valve you need.
Disconnect the wiring harness from this element. To do this, you must first release the special lock that secures the pad.
Check if there is voltage going to the valve. To do this, you need to turn on the multimeter and switch it to voltmeter mode. After this, the black probe of the device is connected to the ground of the car, and the red probe is connected to the connector marked “A”, which is located on the wiring harness. The next step is to start the engine and see what readings the device gives. The voltage should be the same as the battery. If it is not there at all or is too small, then you will probably have to look for a more serious problem. If everything is fine with the voltage, then you can move on to the next step.

Remove the purge valve. To remove it you need to use a screwdriver to slightly loosen the clamps. After this, you can easily move the valve slightly up and smoothly pull it out along a small bracket. After this, the device must be connected directly to the battery terminals. One wire goes to the purge valve (to “+”), and the second is connected to “minus”. After this, both conductors are connected to the corresponding battery terminals. If there is no click, then the valve is completely out of order and it is best to replace it.

Is it possible to remove

Some motorists neglect environmental standards and remove the adsorber valve. The words are basically like this: “why do I need it, the car has become slower, the consumption has become higher, I’ll throw it away altogether.” But realistically, is it possible to do this? Will this make the car worse?

It is worth understanding that a working system does not affect the operation of the engine at all, and even saves a little fuel, because the vapors that remain in the main body are then burned out in the engine. Of course, you should not expect that the savings will be huge, but you get a few kilometers of mileage.

How to check the adsorber valve

If after checking it turns out that the adsorber is in more or less working condition, then it makes sense to check its purge solenoid valve. It’s worth mentioning right away that for some machines, due to their design, some actions will differ, some of them will be present or absent, but in general the verification logic will always remain the same. So, to check the adsorber valve, you must perform the following steps:

Canister valve

Visually check the integrity of the rubber hoses included in the fuel vapor recovery system, in particular those directly approaching the valve. They must be intact and ensure the tightness of the system. Disconnect the negative terminal from the battery. This is done to prevent false alarms of the system diagnostics and to enter information about the corresponding errors into the electronic control unit. Remove the absorber (usually it is located on the right side of the engine, in the area where the air system elements are installed, in particular the air filter). Turn off the electrical power to the valve itself. This is done by removing the electrical connector (the so-called “chip”) from it. Disconnect the inlet and outlet air hoses from the valve. Using a pump or medical bulb, you must try to blow air into the system through the valve (into the holes for the hoses)

It is important to ensure the tightness of the air supply. To do this, you can use clamps or a thick rubber tube. If everything is in order with the valve, it will be closed and air will not be blown through

Otherwise, its mechanical part will fail. You can try to restore it, but this is not always possible. It is necessary to supply electric current from the power supply or battery using wires to the valve contacts. At the moment the circuit closes, you should hear a characteristic click, which signals that the valve has actuated and opened. If this does not happen, then perhaps instead of a mechanical failure there is an electrical failure, in particular, its electromagnetic coil has burned out. With the valve connected to an electric current source, you must try to blow air into it in the manner described above. If it is working properly, and therefore open, then this should work without problems. If it is not possible to pump through air, then the valve has failed. Next, you need to reset the power from the valve, and there will be a click again, indicating that the valve has closed. If this happens, it means the valve is working.

You can also check the adsorber valve using a multifunctional multimeter, switched to ohmmeter mode - a device for measuring the insulation resistance value of the electromagnetic winding of the valve. The probes of the device must be placed at the coil terminals (the places where the wires coming from the electronic control unit are connected to it; there are various design solutions), and the insulation resistance between them must be checked. For a normal, serviceable valve, this value should be within approximately 10...30 Ohms or differ slightly from this range. If the resistance value is small, it means that there is a breakdown of the electromagnetic coil (short interturn circuit). If the resistance value is very large (calculated in kilo- and even mega-ohms), then the electromagnetic coil breaks. In both cases, the coil, and therefore the valve, will be unsuitable for use. If it is sealed into the housing, then the only way out of the situation will be to completely replace the valve with a new one.

Please note that some vehicles allow a high insulation resistance value on the valve coil (in particular, up to 10 kOhm). Check this information in the manual for your car. Thus, in order to know how to check whether the adsorber valve is working properly, you need to dismantle it and check it in a garage.

The main thing is to know where its electrical contacts are located, and also to perform a mechanical inspection of the device

Thus, in order to know how to check whether the adsorber valve is working properly, you need to dismantle it and check it in a garage. The main thing is to know where its electrical contacts are located, and also to perform a mechanical inspection of the device.

The principle of operation of the absorber

The mechanism of action of the adsorber is as follows:

When the car engine is at rest, the pressure of gases evaporating from the surface of the fuel begins to increase in the gasoline tank.
These vapors enter a special container, where they are separated into liquid and gaseous fractions.
The liquid flows back into the gas tank, and the gases under high pressure pass through a system of tubes into the absorber.
After the driver turns the ignition key, the car's electronic circuitry will signal the valve on the engine to open.
Gases begin to escape from the absorber.
The entire volume of accumulated vapor enters the combustion chamber of the combustible mixture.
After entering the engine, the substance released from the adsorber is subject to complete combustion.
The amount of gases entering the engine depends on the time period during which the valve was opened.

Principle of operation

Now let's look at how the absorber works in a general fuel vapor recovery system:

Gasoline vapors are formed in the fuel tank, which rise upward; they enter the separator through the neck hole, where the vapors condense and flow back into the fuel tank
Part of the vapor that has not yet turned into condensate passes through the gravity valve and further along the steam line, and enters directly into the absorber, where the vapor is absorbed by the activated carbon contained in it.
This process occurs when the car engine is not working, the diagram of the entire system is in the photo below

Diagram of a gasoline vapor recovery system

From the diagram it becomes clear where the absorber is connected to the VAZ 2112
When the engine is running, while the machine is moving, the control system promptly opens the solenoid valve, and the absorber substance is purged
And gasoline vapors are mixed with the incoming air from another valve, blown into the intake manifold of the engine, where they are burned

In this case, we get some positive double effect, in which:

firstly, the air is not polluted by harmful fuel fumes
secondly, we get, although small, fuel savings. Since without an absorber, gasoline simply evaporates

It turns out that we save the environment and save fuel, a double benefit.

Absorber malfunctions

However, over time, the absorber becomes clogged and becomes unusable. Our instructions will help determine the signs of a malfunction of such a fuel system unit:

The main symptom is the occurrence of excess pressure inside the fuel tank
Pressure arises due to the appearance of vapors that simply have nowhere to escape from the tank
In this case, when you unscrew the lid, you hear a hissing sound.
It even happens that as soon as you start unscrewing the cap, it is knocked out with terrible force, either the valve is not functioning, or there is a problem with the absorber
In general, you should go to a service station and figure it out, or look for a specialist among your friends and repair it yourself
Until we get to the point of repair, you’ll just have to open the gas tank cap several times a day to let out the fumes
In addition, due to poor performance of the absorber, the car engine speed may fluctuate at idle.
In our home country, the problem of faulty parts is solved very simply, it concerns those without which the car can continue to move
You shoot and move on as if that’s how it should be, folk craftsmen unanimously advise everyone
It’s up to you to decide, of course, but you should remember that you yourself breathe this polluted air, as well as your children (never thought about it, right?)
And if you take and remove all the “extra” environmental parts, since there is no need for them in the car, then one “beautiful” day you will have nothing to breathe

Replacing this part takes 15 minutes; you can do the job in two ways:

on one's own
contact a car service specialist if the price suits you

Diagram of the fuel system of the 16-valve injection VAZ-2112

The fuel system is one of the most important components in any car. After all, without it it is simply impossible to imagine the full operation of the vehicle. And so that you can imagine what the fuel system on your VAZ-2112 consists of, below we will present you with its detailed diagram, with a detailed description of each of the main elements.