VAZ 2109 injector how to check the fuel pump

Fuel pump VAZ 2109 injector does not turn on

Hello everyone, dear car enthusiasts and owners of nines.
Today we will look at the main reasons why the fuel pump on a VAZ 2109 car does not work. Throughout the history of the car’s production, two types of fuel pumps have been installed: electric and mechanical. Everything depended on the type of engine, the injectors were electric and, accordingly, the carburetor nines were equipped with mechanical ones.

Let's start right away with the mechanical fuel pump. The most likely cause of the malfunction may be wear of the diaphragm. When the fuel pump diaphragm wears out, a gasoline leak appears in the housing. And the second reason is pusher failure.

On VAZ 2109 injection engines, you can very easily determine that the fuel pump is not working, just turn the ignition key and if you don’t hear the characteristic sound of the pump that its electric motor makes, then something is wrong with it.

The first step in this case is to check the condition of the fuel pump fuse. This fuse is located just below the glove compartment. In the block of three fuses and relays, you need to check the rightmost fuse, which is responsible for the fuel pump. If the fuse is faulty, it must be replaced with a new one, observing the amperage. And try to find the reason why it burned. You also need to check the fuse contacts for oxidation and, if necessary, clean them.

If the fuse is intact and the contacts are in order, you need to check the VAZ 2109 fuel pump relay. It is located in the same block as the fuse; checking it is very simple, you just need to replace it with a working one. If after replacing the relay the fuel pump starts working, then the problem is in the relay, you need to buy a new one and install it.

If, after replacing the relay, the fuel pump on the nine continues to not work, then you will have to check the fuel pump itself. If the pump starts working during testing, you will have to check the wires that go from it to the relay for breaks.

If, even when connected directly, the fuel pump refuses to work and there is no open circuit in the wires, then the best solution would be to replace it with a new one.

Well, that’s all, we looked at the main reasons why the fuel pump on a VAZ 2109 car does not work.

Guys, save me. The VAZ 2109i just won’t start. It feels like there is no current flowing to the brain. The fuel pump does not turn on, the relays do not work, the fuses are intact, the wires that go to the pump are intact, + there are wires on the brain. Today I measured the voltage on this thing (see photo). When the ignition is off, 6 volts, when on, 3. I decided to check the ground and then I realized that I didn’t understand anything. Any contact squeaks to ground (even those that gave out 6-3 volts) Is this how it should be? If not, what happened and where to dig?

Comments 59

the problem was in the ECU. I changed it to January and everything is ok

Guys. And I have such garbage. I turn on the ignition, the pump pumps up and everything is as it should be. I start it up. The engine runs for a couple of minutes and the pump relay starts clicking. Well, and accordingly, the pump also works in time with the clicking of the relay. The engine seems to be throttling. What kind of garbage can anyone knows

Have you tried changing the relay? Measure the voltage on the relay during such garbage. Will the voltage fluctuate or is it constant 12 volts?

So yes. And if it jumps, then where to dig next?

Then I don’t know then) look at the contacts then. But he shouldn't jump. It's either there or it's not there

Damn, I removed the terminal while it was back to normal. Now I don’t know where to look

People! Tell me about these relays! I had a similar situation the other day, I couldn’t start the car, I checked it with a light bulb, there was voltage coming from the fuse, but the relay didn’t turn on, I replaced the relay, it didn’t help! I look at the cross wires on the relay (as I understand it from the brain) and there is no voltage on them when I turn on the ignition, it turned out that this is only a consequence! There are three relays and three circuit breakers, one for the fan, the other for the fuel pump, and the third for powering the brain? It was the third fuse that blew, I replaced it, installed the same one, it started and it immediately blew! I set it to 10A because 15 had run out, and I really wanted to get home, so it started up and drove another 15 km, and only when I arrived at the gate did it burn out again! What could be shorting there and how to solve it? Until this moment, I replaced the radiator with the stove, the heat is terribly hot, maybe it caused the wires to melt? Only then would it constantly burn out, as I assume, please help! Anyone who has had this problem, please respond!

How to remove the fuel pump

The VAZ 2109 fuel pump is located under the rear seat. The injector implies its installation directly in the tank. The thing is that the pump is a submersible type. In the same unit there is a float-type fuel level sensor. It works due to the fact that the float moves the slider using variable resistance. At the same time, the current in the power circuit changes. The amount of gasoline remaining in the tank is determined by the magnitude of the change. To remove the pump you will need to use pliers, screwdrivers and an 8mm wrench.

It is quite possible that the reason that fuel is not supplied is a non-working VAZ 2109 fuel pump relay. The injector contains it, as well as a fuse, which could easily burn out. Before starting work, thoroughly clean the entire cover so that after removal no dust gets inside the tank. Then, using a screwdriver, loosen the clamps that secure the hoses. Remove them; if you can’t do it with your hands, try gently squeezing them with pliers and twisting them. After this, use a size 8 wrench to unscrew all the nuts that secure the lid to the tank body. Please note that there are washers there. Don't lose them. That's all, now the pump can be easily removed for replacement or repair.

The fuel pump does not pump: causes and diagnostics

Let's start with the fact that if the gas tank is full, the battery is charged, the spark plugs are dry and there is a spark, the starter turns the engine normally, but the engine does not seize, then you should pay attention to the gas pump. A common problem is that there is no power to the fuel pump after the ignition is turned on. In a similar way, the malfunction manifests itself in motion, when the power to the fuel pump is lost and the engine suddenly stalls.

An equally important point is how much the fuel pump pumps. In other words, the pump may hum and buzz (power is being supplied), but not create the required pressure in the fuel line. The pressure in the fuel system with a working fuel pump must be more than 3 bar (which depends on the specific car model). The indicated pressure is accumulated in the fuel rail and has an indicator of 300 kPa and above.

To check, you need to measure the pressure in the fuel rail with a pressure gauge, taking into account the indicators that are the norm for a specific car model. Using the example of injection VAZs, the pressure when the ignition is turned on is 3 atmospheres, at idle the figure is 2.5 atmospheres, when you press the gas 2.5-3 atmospheres. This method will help you accurately determine:

In the second case, when you press the gas, the pressure does not increase; in the latter case, the pressure gauge needle rises, but very slowly or jerkily.

A decrease in pressure below the norm will lead to the fact that the engine may not start or start with difficulty, stall, jerk, operate unstably and with failures. If this happens due to the fault of the pump and not the fuel filter, then there is a high probability that the coarse filter screen of the fuel pump is clogged. In this case, there is no need to change the fuel pump itself, since it will be enough to replace or even clean the mesh.

If you suspect that there is no voltage to the fuel pump, there is a quick way to check. It is enough to turn the ignition key and listen, as when you turn the key you should hear a slight hum from the fuel pump. If such a buzzing noise is not heard, it means there is no power to the fuel pump, there are problems with the wiring, etc.

Also in the general list of possible reasons why the fuel pump does not pump, the following are noted:

Wiring to the fuel pump

On most cars, the wiring to the fuel pump consists of three wires: “plus”, “minus”, and also a wire for indicating the amount of fuel in the gas tank. If the fuel pump does not pump, then the cause may be a lack of power.

To check the power to the fuel pump, just take a 12-volt light bulb and supply it with power from the external connector of the fuel pump. After turning the ignition, the control lamp should light up. If this does not happen, then the problem is in the external circuits. If the lamp comes on, it will indicate the need to check the internal contacts of the fuel pump.

To check the external wiring, you should alternately connect the positive and negative contacts, which are removed from the fuel pump power connector, to the ground of the pump. The contacts must also be connected to the fuel pump relay. If you place the negative contact on ground, after which the ignition is turned on and the light comes on, then this means that this contact is faulty. If the light bulb does not light up, then problems with the “plus” are obvious. If you place a contact on the relay and the light comes on, there is probably damage to the wire on the section that connects the relay and the fuel pump itself.

Fuel pump electric motor

If checking the pressure in the fuel rail and the external wiring to the fuel pump gives positive results, then you should check the fuel pump motor. This electric motor is responsible for circulating gasoline inside the fuel pump.

When checking, you need to take into account that the terminals on the fuel pump themselves tend to oxidize, as a result of which power is not supplied and the pump does not pump. In this case, the motor is working, but the terminals need to be cleaned or re-soldered.

Fuel pump ground contact

Problems with the fuel pump mass may be indicated by a fuel level sensor that is not working correctly. The mass may be poorly secured; in this case, the fuel pump does not pump fuel. The ground wire is usually located under the dashboard and runs through the cabin. It is necessary to find the specified wire, check and clean all contacts, then securely fasten the ground to the fuel pump.

Fuel pump relay

The fuel pump relay is often mounted next to the fuel pump ground, that is, under the dashboard. A normally operating relay after turning on the ignition for a couple of seconds allows the pump to create pressure in the system and immediately turns off.

Checking and adjusting pump pressure

It's no secret that any car part has a certain resource. So the “nine” fuel pump, like any part, eventually stops pumping gasoline properly, our instructions will help you figure it out:

• Moreover, on the VAZ 2109 the problems with the fuel pump are always the same
• As a rule, the reasons are not tightness of the valves or housing, fuel wire, or diaphragm, perhaps the fuel filters are clogged, or the fuel supply lines are overheating
• The main problem is ultimately insufficient gasoline pressure at the outlet of the fuel pump.
• And in the case when your fuel pump initially could not show the appropriate (required) output pressure, then all the problems stated above only aggravate the situation
• You need to know exactly the output pressure (immediately before the carburetor) that the fuel pump should develop when the engine is idling.
• As a rule, all fuel pumps - both cars and trucks - must produce a pressure in the range from 0.20 atmospheres to 0.35 atmospheres. When your gas pump has a similar output pressure, then you should not have problems with gasoline supply
• The pressure is measured with a pressure gauge that has a scale with divisions of 1.6 atmospheres - on such a pressure gauge it will be possible to record the pressure of the fuel pump
• When the pressure is measured and it turns out to be below normal, you may just need to adjust the pump
• It is possible to adjust the fuel pump either by moving it closer or further from the engine block (by changing the thickness of the gasket)
• The second method is to strengthen the spring (washers are placed under it, the operation is performed taking into account the wear of existing parts and the strength of the spring)
• The third option is to change the length of the rod
• Any of the listed measures (or all in combination) make it possible to increase the pressure of the fuel pump to the level of 0.20 - 0.30 atmospheres
• The best thing, of course, is to bring the figure to 0.30-0.35 atmospheres at idle speed
• When the engine starts running at higher speeds, this figure will increase a little more.

Characteristics of the VAZ 2109 fuel pump

To understand how a working pump works and check its operation, it is important to know its operating characteristics:

• The length of its rod is 82.4 millimeters
• In this case, the rod protrudes above the gasket by 0.8 - 1.3 millimeters
• The thickness of the very first gasket is 0.3 millimeters
• And, the stroke of the rod is 2.5 - 2.8 millimeters

The car won't start, but when you turn the ignition key you can't hear the fuel pump running? Don’t rush to replace it with a new one; it’s better to first find out how to check the operation of the gas pump yourself.

Procedure : 1. Check the fuel pump fuse. This is where you should start checking the fuel pump. On a VAZ 2110 it is located near the left foot of the front passenger.

2. How to check the fuel pump relay. The relay is located next to the fuse, so let's check that right away. We check the voltage at the control terminals one by one (87, 86 and 85 in turn), and touch the ground with the other end. The testing tool can be a multimeter or a test lamp with a current consumption of no more than 0.25A. If the lamp does not light and the fuse is good, then we check the wiring and serviceability of the ECU.

Sometimes they check differently, for example, instead of a relay, they connect a test lamp between pins 85 and 86. When the ignition is turned on, the lamp should light up. You can also place a jumper between pins 87 and 30. Does the fuel pump start when you turn the key? This means the relay is faulty. You can also check the fuel pump relay by replacing it with a known good relay.

3. How to check if the fuel pump is working. Without removing it, we check the voltage on its chip using a test lamp or multimeter.

How to check a removed fuel pump . To do this, apply +12V. (for example, from a battery) to the contacts of the fuel pump. Be careful; residual gasoline may ignite from a spark when connecting the contacts.

4. The alarm system is to blame for the operation of the fuel pump. If the car falls into a hole, then after a strong impact the “Valer” button is activated, which blocks the operation of the fuel pump.

A buzzing sound from the fuel pump does not mean it is working, you should check the fuel pump pressure first.

Other causes of fuel pump malfunctions

Quite often, unprofessional installation of additional electrical equipment or security anti-theft systems leads to the fact that the power to the fuel pump is lost due to mixed up contacts or other connection errors.

Finally, let’s add that the gas pump in the gas tank is immersed in gasoline, in which it is actively cooled. The habit of driving with an empty tank can quickly damage the electric motor of the fuel pump, as it burns out.

What functions does the fuel pump relay perform, signs of breakdown. Where is the fuel pump relay installed, how to properly check the fuel pump relay.

Why does the starter turn normally, but the engine does not catch and does not start? Main causes of malfunction, checking fuel supply and ignition systems. Adviсe.

Diagnose faults that may indicate problems with the fuel pump. Self-check of the device, measuring the pressure in the fuel rail.

The causes of whistling and increased noise during operation of the fuel pump are overheating of the pump. How to diagnose and fix the problem yourself. Tips and tricks.

How to change a fuel pump. Location of the fuel pump, releasing pressure in the system, unscrewing the fuel lines, removing the pump, reassembling.

What to do if the car accelerates worse, does not pick up speed, or has failures during acceleration. Why the engine does not pull, how to find the reason for the decrease in power.

Source

How does a fuel pump work?

There is nothing complicated about the fuel supply system. A conventional pump, which is driven by the rotor of an electric motor. To protect the entire fuel system from small particles, a filter is used. But this is not the end of the features, because it is worth noting that it is necessary to maintain the pressure in the ramp at the same level. And the VAZ 2109 fuel pump (the injector simply cannot work without it), provided that it constantly pumps gasoline, will begin to pump up the pressure higher and higher. And this will disrupt the operation of the system.

Therefore, it is necessary to adjust the pressure. For this, a special device is used, which is called a pressure regulator. It is installed in the fuel rail and connected to a pipeline that serves to dump excess gasoline into the tank. When the ignition is turned on, the rail pressure sensor is polled, after which the fuel pump drive is turned on. After the pressure in the rail has increased to the required value, the fuel pump is turned off. Therefore, it does not work all the time.

What fuel pumps were installed on VAZ 2108/2109 cars

Most VAZ 2108/2109 cars were equipped with gasoline engines with carburetor injection of a combustible mixture into the combustion chambers. Only their latest modifications were equipped with fuel injection systems.

Table: serial engines of VAZ 2108/2109 cars

Absolutely all carburetor “eights” and “nines” were equipped with DAAZ mechanical fuel pumps produced by the Dimitrovgrad Automotive Accessory Plant. They were and are now produced under catalog number 2108–1106010.

Mechanical fuel pump DAAZ 2108–1106010

VAZ 2108/2109 injection engines were equipped with electric submersible gasoline pumps produced by Russian enterprises Pekar, Utes, SAAZ, as well as pumps of joint and foreign production. Fuel pumps were installed on the latest modifications. The catalog number of the submersible electric fuel pump VAZ 2108/2109 is 2112–1139009.

Electric pump "Bosch" 2112–1139009

Pump installation

Pay attention to the condition of the wires when replacing the VAZ 2109 fuel pump. The injector involves powering the engine from the on-board network, so there should be no breaks or destruction of the insulation. Installation of the fuel pump is carried out in the reverse order of removal. First, place the body in the tank, landing on the studs. Then you need to tighten all the nuts, then put the hoses in place and connect the plug with the wires.

Source of the article: https://fb.ru/article/192429/benzonasos-vaz-injektor-kak-rabotaet-zamena-i-proverka

Features of the design and location of fuel pumps VAZ 2108/2109

The DAAZ gasoline pump has a simple mechanical design. It includes:

Design of the DAAZ fuel pump

The VAZ 2108/2108 mechanical fuel pump is located in the engine compartment of the car and is installed on the auxiliary drive housing (in front of the ignition distributor). It is driven by the camshaft through a cam mechanism and a rod (pushrod). The camshaft rotates an eccentric, which transmits force through a pusher to a balancer at the bottom of the pump housing. The latter raises and lowers the rod with the diaphragms. Thus, a vacuum is formed at the pump inlet, and pressure is formed at the outlet. Valves located in the device body are responsible for its maintenance.

The VAZ 2108/2109 mechanical fuel pump is located on the auxiliary drive housing

On injection VAZ 2108/2109, the fuel pump is not a separate device, but an element of the fuel module. It also includes:

Fuel module assembly

The module is located in the car tank. Its lid (base) is located at the top of the container. You will find it by removing the back seat and peeling back the carpet.

The electric fuel pump in the injection VAZ 2108/2109 is located in the car tank

Structurally, the fuel injection pump VAZ 2108/2109 is an electric motor with an impeller on the shaft, which, rotating, pumps gasoline, creating a vacuum at the inlet fitting and pressure at the outlet. The pump is powered from the machine’s on-board network, protected by separate relays and a fuse.

Design of the electric fuel pump VAZ 2108/2109

An article dedicated to self-repair and replacement of the gas tank on a VAZ 2109 is located here: https://vazweb.ru/desyatka/pitanie/zamena-benzobaka-vaz-2114.html

Checking the pump on the injection "nine"

The VAZ 2109 with an injection engine has an electric pump. It is powered by receiving voltage (12 V) from the battery. Its location is directly in the Lada gas tank. The mission of the electric pump is to deliver gasoline to the fuel rail under high pressure. Next, the fuel from the ramp enters the nozzles, which inject it into the combustion chamber.

If the injector on a VAZ 2109 does not pump the fuel pump, check the following elements:

• fuel pump relay VAZ 2109;
• fuse;
• voltage to the pump;
• wires from the mounting block to the pump;
• pressure in the fuel rail.

A working fuel pump should start working when the engine starts. The sound of its operation should be heard under the rear seat. We begin the first stage of verification.

Possible situations and your actions

We take a voltage indicator and check the serviceability of the relay and fuse, which are located in the mounting block.

If the electrical circuit connection diagram is in order, you need to check the voltage supply directly to the pump. To do this, we dismantle the rear seat of the Lada 2109 car. Under it there is the top cover of the pump and the connected wire connector from the mounting block, and the fuel line hose is also supplied here. We disconnect the contacts and unscrew the bolts on the cover.

Now you have direct access to the pump. We remove the fuel pump from the gas tank.

We measure the voltage at the fuel pump using a multimeter (tester) or a 12-volt light bulb. If the device shows that voltage is supplied to the VAZ 2109 fuel pump, the problem is not electrical. This means that the fuel system should be checked. Well, if there is no voltage, you don’t have to worry about the pump malfunctioning. Just check the integrity of the wire leading from the mounting block to the pump for damage.

On a fuel-injected "nine", the fuel level in the gas tank should be maintained at least 10 liters. This is done to ensure that the fuel pump does not suck in air under any circumstances. We check the serviceability of the pump by measuring the pressure in the fuel rail.

We connect the device to a special hole in the ramp. If the voltage is normal and the pressure gauge shows no pressure, the problem may be in the fuel filter. We check its integrity and throughput. If the filter is working properly, we check the fuel line leading from the gas tank to the ramp.

If all these parts are in good working order, we conclude that the fuel pump itself has failed. Having replaced the pump with a new one, we connect it and try to start the car. If the car starts, the problem really was in the pump. If the engine fails to start, the fuel system should be checked more carefully.

In the absence of a pressure gauge, the performance of the gasoline pump is checked by the amount of gasoline pumped per unit of time.

This check can be performed by connecting a hose to the ramp and lowering it into a container. We wait and let the fuel flow into the container for one minute. Then we check the volume of fuel in the container. It should be from 0.5 to 1 liter.

How to check a mechanical fuel pump VAZ 2108/2109

Checking a mechanical fuel pump involves determining its performance, i.e. measuring the amount of fuel pumped per unit of time. And according to the characteristics of the device, it should be at least one liter per minute. To determine it, you will need an assistant, as well as the following tools and tools:

We lower the hose from the outlet fitting into an empty bottle

If the amount of gasoline pumped in one minute is less than a liter, the pump is faulty

Further diagnostics should be aimed at identifying the faulty pump element. To carry it out you need:

You should feel a vacuum at the inlet fitting, and air pressure at the outlet

The mesh filter must be clean and free from mechanical damage.

If the diaphragms are damaged or deformed, they must be replaced

The length of the pusher should be 82.5 mm

Connection diagram for electric fuel pump VAZ 21083, 21093, 21099 (injector)

On VAZ 21083, 21093, 21099 cars with a 2111 injection engine, an electric fuel pump is installed. It is located in the fuel module installed in the fuel tank.

For VAZ 21083, 21093, 21099 vehicles with ECM control unit (controller) January 5.1 (2111-1411020-61). Euro-2 toxicity standards (one oxygen sensor).

After turning on the ignition, the control unit supplies 12V to the fuel pump relay. The relay supplies voltage to the fuel pump. It turns on and builds up pressure in the engine fuel system. If there is no signal from the DPKV (the crankshaft does not rotate), the ECU turns off the relay and the pump. If the crankshaft rotates, the relay and the fuel pump work. All this work is accompanied by relay clicks and the buzzing of the electric fuel pump in the gas tank.

Notes and additions

— A similar connection diagram for the electric fuel pump (fuel pump) of VAZ 21083, 21093, 21099 cars with an injection engine 2111 and an ECM control unit M1.5.4N. The only difference is the color of the wires.

More articles on injection engines of VAZ 21083, 21093, 21099 cars

Connection diagram for electric fuel pump VAZ 21083, 21093, 21099 (injector): 1 comment

During the operation of any car, the need arises to replace parts and assemblies. If you intend to install a new injector on a VAZ 21099, then in recent years the automaker has been producing a unit with an M73 21114-1411020-12 Itelma controller, for which you will also have to replace the wiring.

Mechanical fuel pump repair

The functionality of a mechanical fuel pump can be restored by replacing its faulty elements. You can buy them at any automobile store. But it is better to buy not individual spare parts, but a repair kit. It includes all the elements that can fail:

Replacing valves

How to change apertures

To replace the diaphragms, you need to unscrew the nut by 10 in the upper part of the rod. Next, we remove the damaged elements, and in their place we install parts from the repair kit.

The kit includes three diaphragms: two working and one safety. The latter serves to prevent unauthorized fuel from entering the carburetor if the first two are damaged. It is installed at the very bottom of the rod immediately after the lower “plate”. We place spacers on top of it on the rod: first a small one, then a large one. We place the working membranes and the upper “plate” on them. We secure the resulting structure with a nut.

The mechanical fuel pump has 3 diaphragms

Replacing the pusher, thermal spacer and gaskets

The thermal spacer does not need to be replaced unless it is damaged. Inspect its mating surfaces, especially the outer one, to which the lower part of the pump housing is attached. It should be perfectly smooth. Otherwise, oil leakage may occur at the junction of parts during engine operation.

Replacing the pusher is carried out by removing the old one and installing a new rod in its place. There is no difference in which end where it will be installed.

Now about the gaskets. There are only three of them in the repair kit, and they have different thicknesses:

The first is intended for installation between the thermal spacer and the auxiliary drive housing, and the gaskets “B” and “C” are used to adjust the protrusion of the pusher above its mating surface.

The adjustment is made as follows:

Installation of gaskets and thermal spacer

The thinnest gasket is installed between the spacer and the accessory drive housing

The pusher should protrude 0.8–1.3 mm above the mating plane of the spacer

After the adjustment is completed, the fuel pump is installed in place and secured with nuts.

Pinout and diagram of a fuel pump with a VAZ relay

The fuel pump on a car is designed to supply fuel to the combustion chamber. Its operation is controlled using a relay. On a VAZ (depending on the model), the fuel supply unit can be electrical or mechanical - it all depends on the fuel supply system. On a fuel-injected car, the fuel pump is located in the tank. When the ignition is turned on, voltage is supplied to the terminals of the unit and it begins to pump fuel. If the required pressure is created in the system, the relay automatically turns off the fuel pump - the engine is ready to start.

When the ignition is turned on, the relay creates pressure in the fuel lines by turning on the fuel pump (BN) for a couple of seconds. After this, the BN will work either when the engine is cranked by the starter, or when the engine is running.

Sometimes this system needs repairs - there is nothing complicated here, and the editors of the 2Skhema.ru website will tell you how to do it yourself. Let's start with the BN pinout, then we will indicate it on the diagrams and at the end there will be instructions for replacing the fuel supply elements.

Pinout of fuel pump VAZ 2107

1 – radiator fan drive motor; 2 – mounting block block; 3 — idle speed sensor; 4 – engine ECU; 5 – potentiometer; 6 – set of spark plugs; 7 – ignition control unit; 8 – electronic crankshaft position sensor; 9 – electric fuel pump; 10 – indicator of the number of revolutions; 11 – lamp for monitoring the health of electronic systems and the brake system; 12 – ignition system control relay; 13 – speedometer sensor; 14 – special factory connector for reading errors using the BC; 15 – injector harness; 16 – adsorber solenoid valve; 17, 18, 19,20 – fuse box for repairing the mounting block that protects the injection system circuits; 21 – electronic fuel pump control relay; 22 – electronic relay for controlling the exhaust manifold heating system; 23 – exhaust manifold heating system; 24 – fuse protecting the heater circuit; 25 – electronic air sensor; 26 – coolant temperature control sensor; 27 – electronic air damper sensor; 28 – air temperature sensor; 29 – pressure control sensor and low oil pressure lamp.

You can check the fuel pump on a VAZ 2107 simply by checking the voltage at its connection block with a tester. The presence of voltage will indicate a malfunction of the electric motor. Instead of a tester (multimeter), you can use a test lamp to diagnose a malfunction.

In the absence of one, this can be done by disconnecting the connection block for the fuel pump and fuel level control and applying voltage with wires from the battery to the place where the gray wire is connected +12 and to the place where the black wire is connected - minus. A humming pump will indicate a faulty fuse, power circuit or ECU.

Pinout BN VAZ 2108, 2109, 21099

The fuel pump activation relay (2) is shown by an arrow.

1 — nozzles; 2 — spark plugs; 3 — ignition module; 4 — diagnostic block; 5 - controller; 6 — block connected to the instrument panel harness; 7 - main relay; 8 - main relay fuse; 9 — electric fan relay; 10 — controller power supply fuse; 11- electric fuel pump relay; 12 — fuel pump power circuit fuse; 13 — mass air flow sensor; 14 — throttle position sensor; 15 — coolant temperature sensor; 16 — idle speed regulator; 17 — knock sensor; 18 — crankshaft position sensor; 19- oxygen sensor; 20- APS control unit; 21 — APS status indicator; 22 — speed sensor; 23 — electric fuel pump with fuel level sensor; 24 — solenoid valve for purge of the adsorber; 25 — block connected to the ignition system harness; 26 — instrument cluster; 27 — ignition relay; 28 — ignition switch; 29 — mounting block; 30 — electric fan of the cooling system;

Replacing a mechanical fuel pump VAZ 2108/2109

Replacing a mechanical pump assembly will take no more than half an hour. To implement it you will need:

Removing a faulty pump

Securely secure the pump with nuts

Pump gasoline into the pump by pressing the manual pump lever

Checking the fuel pump

• Let’s immediately look at the two most common types of gasoline pumps, “Pekar” and DAAZ. They are installed on both rear-wheel drive and front-wheel drive cars. To check the serviceability and functionality of the entire fuel supply system:
• Remove the gasoline hose from the outgoing (discharge) fitting of the gasoline pump
• Then press the fuel pumping lever manually several times
• If the VAZ fuel pump is working properly, then a powerful stream of fuel should come out of the fitting
• If there is no stream, or there is a weak stream, perform a second check

To check the serviceability of the intake valve:

• We disconnect the fuel hose from the suction fitting of the pump (it turns out that now we have removed both fuel hoses from two fittings)
• Then we plug the suction fitting with our finger and press the lever for manual pumping several times
• At the same time, you should feel a vacuum on your finger (it should be sucked to the fitting)
• When there is a vacuum, this means that the fuel pump is working, look for faults in the gas tank or fuel lines
• If not, the fuel pump on the VAZ 21093 does not work, remove the pump, disassemble and change the intake valve

To check the exhaust valve for leaks:

• Place your finger on the hole in the injection fitting (the one that supplies gasoline to the carburetor), then press the lever several times to manually pump
• At the same time, a very noticeable stream of air comes out of the fitting hole, it pushes the finger away from the fitting
• If the stream is weak or absent, it means that the fuel pump on the VAZ 2109 does not pump, then remove the pump, disassemble and replace the exhaust valve
• If the filter is deformed or clogged:
• Remove the cap from the fuel pump, take out the fuel filter, clean it, rinse it in gasoline, then blow it with compressed air
• If the filter is deformed, then change it
• In the Pekar brand fuel pump, as well as similar pumps, the filter is removed by unscrewing the suction fitting from the cover, so you don’t have to remove the cover itself
• In case of malfunctions (leaky, torn) of the diaphragm:

Checking the performance of the fuel pump on injection VAZ 2108/2109

If in Sputniks and Samaras with carburetor engines, fuel pump malfunctions are associated only with its design, then in injection vehicles they can also be caused by problems with the power supply of the device.

Diagnostics of the electric circuit of the fuel pump

To check whether voltage is supplied to the fuel pump, turn on the ignition without starting the engine and listen. When you turn the key, you should first hear the click of the relay, and then the characteristic “squeal” that the electric motor of the fuel pump emits. If these sounds are absent, the search for the problem should begin with the pump circuit protection devices.

The fuel pump relay and fuse are located in an additional mounting block, which is located under the glove compartment. The pump relay (R2) is installed in the middle, and its fuse (F2) is located to the left of it.

The fuel pump relay and fuse are located in an additional mounting block under the glove compartment.

We check them in this order:

Checking the fuel pressure in the system

If the diagnostics show that the pump is working, but the above signs of its malfunction are observed, you need to check the fuel pressure in the system. For this you will need:

We check the pressure in the following order:

The fitting is located at the end of the ramp on the right side

Unscrew the spool with a nipple cap

We connect one end of the hose to the pressure gauge, the other to the fitting on the ramp

The pressure when the ignition is on should be 2.8–3.2 atmospheres

Electrical circuit of the fuel pump in the injection VAZ 2110

The VAZ 2110 car with an injector system, even several years after the model was discontinued, is still very popular among car enthusiasts. The main reasons for this are the ease of maintenance and reliability of the machine. However, there are also negative aspects: the VAZ 2110 with an injector system very often has problems with electronics. The electrical circuit is quite complex for a Russian car and has 75 elements.

However, the weakest point is the fuel pump.

Its electrical circuit looks like this:

• The main one is the fuel pump relay; all the necessary fuses are installed there.
• Next, the electrical circuit diverges from one of the fuses to the diagnostic block and the device itself.
• From the next to the main relay and injectors.
• Next, the electrical circuit goes to the electronic control unit.
• Also, the fuel pump electrical circuit goes to the battery.

Thus, it turns out that the VAZ 2110 with an injector, the pump contains 4 electrical parts. In case of failures related to the operation of the pump, they should be checked first.

Principle of operation

To make it easier for you to understand the electrical circuit of the 2110 with the injector system, let’s consider its structure and the principle of operation itself.

So, the following take part in the process:

• Electronic control unit.
• Relay for turning on the fuel unit.
• Fuses that protect the electrical circuit of the device from overloads.

Wiring diagram VAZ 2110

In practice, the fuel unit starts working when the key is turned and ignites one turn. Before starting the engine, listen - at this moment you can hear the device starting to work and pumping gasoline.

Malfunctions in the electrical circuit

Now that you know the structure of the unit, let's figure out what to do if it malfunctions. So, if it shows no signs of life, the problem is most likely in burnt-out electrical parts.

You need to look for them not in the electrical unit, but directly in the interior of the VAZ 2110 with an injector system. The process looks like this:

• First of all, find the fuses. They are located near the front console on the right passenger side. There you need to find the plastic shield and dismantle it. (The part is secured with three self-tapping screws).
• There you will find three fuses and the same number of relays.
• The relay located in the center feeds the fuel. To the left of it is the one that protects the injectors. It must be removed and checked for functionality. If the part is oxidized, clean the contacts. If there is no visible damage, the fuse may have blown and will need to be replaced.

If the above methods do not help, you should not interfere more actively with the electrical system of a VAZ 2110 with an injector system. Unknowingly you can only damage the car.

The fuel unit will stop working and then more expensive repairs will be required. Therefore, it is better to entrust the process to professionals.