A common failure associated with the fuel system is that the fuel pump fuse blows. In this case, power is not supplied to the pump, and the fuel pump itself stops pumping gasoline into the main line. As a result, the car stalls, the pump does not buzz in the gas tank after turning the ignition key, and the engine does not start.
We also recommend reading the article on how to check the fuel pump relay with your own hands. From this article you will learn about where the fuel pump relay is located, as well as the available methods for checking it yourself.
Fuel pump fuse: faults and location
Where is the fuse for the fuel pump? A frequent breakdown that is associated with the fuel system. is that the fuel pump fuse is blown. In this case, power is not supplied to the pump, and the fuel pump itself stops pumping gasoline into the main line. As a result, the car stalls, the pump does not buzz in the gas tank after turning the ignition key, and the engine does not start. We also recommend reading the article on how to check the fuel pump relay with your own hands. From this article you will learn about where the fuel pump relay is located, as well as the available methods for checking it yourself.
Why do fuel pump fuses blow?
A fuse is a small element whose task in the design of electrical circuits is to melt in the event of an overload. The device melts and the current-carrying circuit opens. Using the example of a solution from the popular VAZ Priora model, we can superficially examine the design and operating principle of the fuse. The device is small, the outer casing is made of plexiglass. There is a conductive element inside. Such an element is based on several plates, which are made of different materials. Between these plates there is a special low-melting material. Electricity passes through this material, which allows the fuse to be an integral part of the electrical power circuit of the fuel pump.
Fuses have a special marking in the form of the letter F. This designation indicates that the fuse element belongs to a circuit whose power is not large. To calculate the current that certain devices are designed for, you need to divide the power by 220. The result will be a figure in amperes.
If the fuse is blown, then such a malfunction is often caused by the following reasons:
- short circuit in the electrical circuit;
- failure of the fuel pump relay;
- low quality of the fuse itself;
In other words, more often the fuel pump fuse blows due to faults in the electrical circuits or as a result of failure of the components of the pump power circuit. Note that situations also arise when the fuel pump fuse burns on its own, but this phenomenon occurs much less frequently with high-quality elements.
Fuel pump fuse location
In the process of searching for a faulty element, car enthusiasts are often interested in where the fuel pump fuse is located on a VAZ 2110 or Priora, as well as on various models of foreign-made cars. Let's start with the fact that almost any modern car has several special fuse blocks. This decision is due to the fact that several devices in the circuit significantly reduce the risk of fire. Also, these solutions conditionally localize possible fault areas, dividing the circuit into segments from block to block.
For this reason, fuse blocks are often installed both in the engine compartment and in the vehicle interior. For example, the fuel pump fuse on a Lada Priora may be located in different places, depending on the type of dashboard installed on a particular car.
With the so-called “high” panels, the fuse for the fuel pump is located on the left in the area of the front passenger's feet. As for the “European” panel on the VAZ, in this version this element in the fuel pump circuit is located under the control controls for the interior heater (stove).
Checking the fuel pump fuse
Before starting the test, it is advisable to study the location of fuses in the blocks of various cars. This can be done using the operating instructions for a specific vehicle, on specialized auto forums, etc. Having decided which fuse is responsible for the fuel pump and where the specified element is located, you can begin to look for the problem.
- To check and replace the fuel pump fuse yourself, you will need a special clamp or tweezers. First you need to remove the cover from the fuse box, which is usually secured with latches. Next, we find the element itself responsible for the operation of the fuel pump. For example, in Priora the solution is designated F13 and passes a current of 15A.
- Now we remove the element using a clamp, pliers or tweezers. If the fuse is blown, then you should carry out an in-depth diagnosis of the wiring condition and check the contacts on the fuel pump itself, after which the faulty element in the pump circuit is replaced with a new one.
Please note that you should only replace blown fuses on your car after the underlying problem has been resolved. Simply replacing a fuse will cause the new element to quickly fail again. If the fuel pump fuse is intact, then the pump relay and the fuel pump itself are checked. The terminals tend to oxidize over time, the pump relay sticks, electrical circuit breaks may occur, etc. We also recommend reading the article on how to check the fuel pump pressure yourself. In this article, you will learn how fuel pressure is measured in the fuel rail and the performance of the fuel pump is determined. Note that on the VAZ 2110 and Priora the pump fuse is located next to the relay. It is enough to lightly knock on the relay itself, which often allows you to restore its functionality.
Tips and tricks
When checking and/or replacing fuses and relays, it is important not to mix up the installation locations during reassembly. If the components in the fuse box are installed incorrectly, then various electrical equipment may become inoperable. Due to the low cost of the relay and fuel pump fuse (about 1-2 USD for each element), it is recommended to completely refrain from installing various jumpers and other solutions unless absolutely necessary. Such methods allow you to bypass power to the pump, which significantly increases the risk of fire or failure of electrical equipment. Finally, we would like to add that purchasing high-quality original parts guarantees their durability. The possibility that something in the pump circuit will burn out on its own for no reason is minimized. This recommendation fully applies to the fuel pump relay.
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Diagnostics
On any car, in order to determine a malfunction of the fuel pump or other elements of the system, you cannot do without diagnosing the fuse. However, before proceeding to directly testing the components in the blocks, it is recommended to thoroughly study their location.
The car manual always provides operating assistance, decoding of protective elements, etc. After identifying the required fuse that is directly responsible for the fuel pump, you can begin to search for the problem.
Removing the fuse
Before doing this, it is important to adhere to the following instructions.
- Have a special tool with you that can be used to easily remove the fuse. As a rule, specialists use ordinary tweezers.
- Before removing the fuse, you must remove the cover of the special unit (it opens with latches).
- You can remove the fuse not only with tweezers, but also with a clamp or pliers.
- If the element is burnt out, a major inspection should be carried out. Check the condition of the wires. It is also important to diagnose the contacts on the electric pump itself.
- Fuses can only be changed after the original cause of the burnout has been determined. If this is not done, the new element will also burn out.
- If the fuse is intact, it is necessary to test the relay and the fuel pump itself.
As mentioned above, the electric pump fuse can be located in different places. So, on the “ten” and Lada Priora it is often installed near the relay responsible for the same functions. Sometimes, in order to make the fuse work, it is enough to knock on the relay.
When replacing an element, the main thing is not to confuse the installation location, because if it is installed incorrectly in the unit, the main parts of the electrical equipment are at risk.
The price of protective elements for a VAZ car is low. A fuse costs about 50-70 rubles, a relay costs a little more.
Where is the fuel pump relay and fuse on Kalina?
The gasoline pump is an integral part of the power system of a gasoline engine. In order for the pump in the Lada Kalina model to function uninterruptedly, there must be a working fuel pump relay in its electrical supply circuit. The pump takes in a portion of fuel, which is traditionally located in the tank. In Lada Kalina, this container with gasoline is located in the rear of the body.
There are special pipelines as lines that transport fuel not only to the ramp with injectors, but also back to the tank.
Using a pump, a certain amount of pressure is generated in the fuel rail, which allows the injectors to spray gasoline in the form of a torch (the so-called “fog”). The fuel pump fuse also plays an important role.
About the reasons for the failure of the fuel supply system
As noted, in the Lada Kalina model the fuel pump is equipped with an electric drive. This provides a number of specific and important benefits. Here the priority is simplicity in design and reliability, allowing the device to have an impressive service life. We also note the high safety when the fuel supply system stops functioning when the engine is stopped. In order for the pump to “live for a long time”, it requires high-quality gasoline, which also serves as a coolant for the device. So, more about the main reasons:
In any case, if the pump does not work, then a thorough diagnosis of the entire fuel supply circuit will be required; you must check the pump fuse, as well as the fuel pump relay.
Changing the fuel pump relay
In Lada Kalina, this electrical element is located in the cabin, more precisely below the panel and close to the air duct grille. To provide access to the specified relay, you will need to remove the cover of the mounting block. In this case, you will need a small flat-tip screwdriver. Before directly removing the fuel pump relay, don’t be lazy to check the fuse, which is also located in the block, but near the transmission lever and ashtray. The fuse link jumper must have a complete appearance. If there is a malfunction, then replace the fuse with a new insert with a similar current rating. To remove the element from the mounting socket, use tweezers. Having made sure that the fuse is intact, but the pump still does not work, we move on to checking the relay. There is a certain nuance here. A faulty relay is dismantled using a socket-type wrench, so we stock it up in advance. When all the faults present in the pump’s power circuit have been eliminated, we start the motor and verify the functionality of the device. If the fuel pump still does not work, then more in-depth diagnostics of all components of the power system will be required.
Troubleshooting pumps
Now let's move on to consider the situation when the reason lies directly in the fuel pump itself. Replacing a unit is a drastic measure that can be avoided in almost the vast majority of cases. Scheme
This type of routine maintenance is not covered by the Lada Kalina operational manual. Despite this, the mesh on the pump should be replaced every 50 thousand km of the distance traveled. Such experience has the right to life due to the insufficient quality of domestic fuel. Determining the need to replace the pump filter component is not difficult. As noted, this is done through visual inspection. Usually the mesh contains a dirty-brown mixture, which includes metal particles and other debris. The bottom of the pump assembly cup is often littered with solid particles of various natures. Regarding the previously mentioned possibility of washing the mesh, many experts have a negative attitude towards this practice. Compared to the labor costs of dismantling the pump, the cost of the mesh itself is quite insignificant - about 100 rubles. It would be more rational and correct, in our opinion, to replace it, the main thing is to know where it is.
About work culture and regulations
The fuel system of LADA Kalina (and not only) requires cleanliness of both the gasoline itself and the components involved in its supply to the engine. All dismantled parts of the system must be perfectly cleaned and washed before reinstallation. When replacing the mesh, we also recommend replacing the filter used for fine fuel purification. Where is this filter located? It is located inside the right stern wheel arch near the jack stand cup.
According to the regulations, this element requires replacement no less than after 30 thousand kilometers.
Note that there are two more mesh filters along the fuel path in the circuit, one of which is installed in front of the fuel pressure regulator, and the second directly in front of the injectors. These filters “take over” fuel that has already been practically purified in the preliminary stages, so the need to replace them is extremely rare.
Let's sum it up
The fuel system in LADA Kalina is a capricious mechanism that places increased demands on the quality of gasoline and the timeliness of routine maintenance. The uninterrupted functioning of all components in the system is possible only if these two main conditions are met. Let us remind you that owners should replace fine filters no later than after a mileage interval of 30 thousand km, and you now know the pump grid after every 50 thousandth mark, where each component is located.
Starter problems
Water in the starter almost always causes corrosion on the armature. This, in turn, often subsequently prevents the mechanism from functioning properly. In this case, the anchor will rotate with great difficulty or will remain motionless.
Most often, the starter fails after the car gets too hot. This motor, located in the engine compartment in close proximity to the power unit, receives part of its heat. As a result, the metal elements expand and lose their ability to rotate freely.
In this situation, clicks will not begin to be heard immediately after turning on the ignition, but after a few seconds. Moreover, the sound itself will be noticeably quieter than usual. Cleaning the armature with fine sandpaper and lubricating it will help get rid of the problem.
The graphite brushes and bearings with bushings also wear out quite a lot on the starter. All these parts are subject to heavy loads. They are replaced with new ones.
It is quite rare for the starter gear to break. But its refusal is evidenced by a specific crackling sound.
It is important to make sure that the noise is not coming from the traction relay
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Malfunction of the fuel pump relay: checking and replacement
The fuel pump relay is a device that provides and stops power supply to the fuel pump upon command from the ECU. The device is fully responsible for controlling the fuel pump, and also performs certain additional functions, which depend on the specific brand and equipment of the car. For example, on cars with automatic transmission, if it is necessary to activate the kick-down mode (intensive acceleration), the specified relay is activated.
Where is the fuel pump relay located?
To answer the question of where the fuel pump relay is located, you need to know exactly the make and model of the car. The installation location on different cars is the area near the injection control unit; the solution can be installed under the dashboard near the fuse box, etc.
Signs and Symptoms of a Bad Fuel Pump Relay
Let's start with the fact that the fuel pump is controlled through a relay according to the following general scheme:
Also on some cars the device serves as a kind of engine speed limiter. If the engine speed approaches maximum and begins to exceed the permissible threshold, the fuel pump is switched off via a relay. The gasoline supply stops, the speed decreases, after which the element supplies power to the pump again. If the relay malfunctions, then power may not be supplied to the fuel pump. The second option is that the pump hums or hums constantly, that is, it does not turn off a few seconds after the required pressure is created in the fuel line. In the first case, the engine often cannot be started because the pump does not pump and there is no gasoline in the fuel rail. In the second case, the fuel pump relay gets stuck (the fuel pump relay does not work) and the battery charge is consumed for the constant rotation of the fuel pump motor. Let us add that on some cars, starting the engine is possible even if there are certain malfunctions in the operation of the element, since the pump relay connection diagram allows the device to operate while the starter is cranking.
Checking the fuel pump relay yourself
At the beginning of the test, you need to get to the following elements: the pump fuse and its relay. Having decided which relay is responsible for the fuel pump, you should also inspect the fuse. Additionally, you need to check the fuse because the fuel pump relay heats up and then does not respond in a timely manner or does not operate at all due to a malfunction of the specified fuse. Now let's look at another available way to check using the example of a VAZ 2110 car. The fuel pump relay itself in this model is located near the fuse.
Finally, we add that the element may also refuse to work or stick after failures or unqualified installation of a car alarm/immobilizer. The fact is that security and anti-theft systems with an engine start blocking function are often based on interrupting the power supply to the fuel pump. In this case, these systems must be diagnosed separately. . significant fuel consumption is noted, then the problem may be not only in the fuel pump grid, motor or its relay, but also in the fuel pressure regulator. In this case, it is necessary to check the fuel pump, fuse and fuel pump relay.
The fuel pump relay is often mounted next to the fuel pump ground, that is, under the dashboard.
The fuel pump whistles and hums. Let's start with the fact that the proper operation of the fuel supply pump assumes. This click is produced by the fuel pump relay. Remote engine start module. Faulty fuel pump relay: check and replace. A hot engine has difficulty starting. Faulty fuel pump relay: check and replace. How to clean the fuel pump screen yourself.
Purpose and general structure of the fuel system
A car's fuel system (or fuel supply system) is a system designed to supply fuel (gasoline or diesel) from the fuel tank to the engine (more precisely, to the carburetor or injectors). This system also ensures that fuel is stored and cleaned before being supplied to the engine.
Regardless of type, any fuel system contains several main components:
- Fuel tank;
– Fuel piping system;
- Fuel pump;
– Fuel filter (or filters);
– A device for forming a fuel-air mixture or a device for injecting fuel into the cylinders.
Fuel tank. This is a fuel storage tank. The tank of modern cars is a rather complex system that contains several components: the tank itself, the fuel filler neck, the fuel level sensor, the fuel pump (however, in many systems the pump is installed in the engine compartment) and others. The tank is also connected to a fuel vapor recovery system, which contains a separator, fuel lines, an adsorber and several valves.
Fuel lines. These are tubes that supply fuel from one component to another. Fuel is supplied from the tank by the fuel supply line, and excess fuel is returned from the carburetor, injectors or injection pump (in a diesel engine) through the drain pipelines.
Fuel pump. This is a device that supplies fuel from the tank to the engine. In fuel injection systems, the pump creates high pressure. Diesel engines have two pumps - low and high pressure (a booster pump can also be used in injection engines). Today, electric pumps are most often used, but diesel engines use traditional mechanical plunger injection pumps.
Fuel filters. Usually there are two of them - coarse and fine cleaning. The coarse filter is simply several thin metal mesh installed in the fuel tank. The fine filter is more complex; it is installed in front of the carburetor, ramp or injection pump. Filters ensure fuel purification from various contaminants, dust and foreign solid particles.
The device for forming the fuel-air mixture is a carburetor into which gasoline and air are supplied, where they are mixed and supplied through the throttle valve to the engine intake manifold. In injection and diesel engines, air is supplied by a separate throttle unit, and the formation of a combustible mixture occurs directly in the cylinder.
Fuel injection devices. These are injectors in diesel and injection gasoline engines. However, in diesel engines (as well as in injectors with direct injection), the injectors are installed directly in the cylinder heads, and in injection engines - in the intake manifolds.
Also, the fuel system of modern cars includes a control unit that controls the fuel supply, the formation of a fuel-air mixture and changes in engine operating modes depending on the load and other conditions. The control unit operates based on readings from numerous sensors installed in various engine components and other vehicle systems.
Today, there are two main types of fuel systems - gasoline and diesel engines. Each of them needs to be described in more detail.
Where is the fuel pump fuse in a VAZ-2114 car?
If the fuel system on a VAZ-2114 begins to malfunction, then experienced specialists warn that the problem may lie in the fuel pump fuse. Where is this part located? What functions does the fuel pump fuse perform? What are the reasons for its breakdowns? Answers to such questions can be found in this article.
Fuel pump fuse and its functions
The fuel pump safety device, not only on the VAZ-2114, but also on other passenger cars, is just a small element in the vehicle’s fuel system. It has a relatively small size, but carries an important functional load. The main function of this element to protect the functions of the fuel pump is to open the conductive circuit of the automobile fuel system. This need arises in case of overload of electrical circuits. As soon as such an overload occurs, the fuse element melts as a result of the high temperature, and the electrical circuit becomes open. The safety element is small in size, and its design is quite simple:
- the outer casing is made of plexiglass;
- inside the device there is a conductive element made of plates and fusible material;
- the body is marked in the form of the Latin letter “F” (this designation indicates that the safety device is intended for an electrical circuit with low power).
Thanks to the metal plates and the fusible material between them, the fuel pump fuse perfectly conducts electric current, but at a power that corresponds to the markings on the body of this part. If the power indicators in the electrical circuit are higher than the required value, the low-melting material immediately begins to melt, and the current-carrying circuit opens.
Reasons for the blown fuel pump fuse on a VAZ-2114
Experts note several main reasons why the fuel pump fuse on a VAZ-2114 may fail:
These reasons are standard for most passenger cars.
Where is the fuel pump fuse on the VAZ-2114
In modern passenger cars, the manufacturer installs several special safety blocks in the current-carrying circuit at once in case of unforeseen situations that could damage the vehicle. This is done to reduce the risk of fire. Such fuses localize the entire electrical circuit to key areas where short circuits are most likely. Any vehicle has instructions that contain detailed diagrams of the location of all parts. The VAZ-2114 also has a fuel pump safety device located under the hood. More precise location of this part:
- open the hood;
- look towards the windshield;
- there is a plastic box on the ECU;
- This box contains the fuse we need.
An introductory word about protective elements
Electrical circuits on Priora require protection, the functions of which are performed by fuses. These elements are equipped with fusible inserts. They are designed for a maximum current rating, which is different for each fuse. These protective elements are located in a special block on the left side of the driver, at the bottom of the instrument panel. The fuse for the Priora stove, as well as other protective elements, has a pin shape, inside of which there is a fuse-link. It is this insert that tends to burn out at the moment when the current exceeds the permissible value.
The structure of the electrical wiring diagram contains another protective element: a relay. They are installed on the most powerful current consumers. These include the rear window heating system, heater fan motor, engine cooling fan, and car horn. Such protective parts are also placed in a common block. Priora heater relays are necessary to reduce the current load that is applied to the switch contacts. With such a protection system, contact pairs do not burn out.
In case of malfunctions with the heater, you must also pay attention to the relay
Now that we have found out where the Priora stove fuse is located, we can move on and get acquainted with other aspects of replacing this important element
Lada Priora: fuel pump fuse and its features
One of the most vulnerable points in Priora is the fuel pump fuse, which often has to be changed and often done independently. Lada Priora in the minds of our motorists traditionally belongs to the category of cars that their owners repair themselves. One important component is the relay and fuse box. It is also known as a mounting block. This is the most important component of the car system, which integrates all the electrical equipment of the car. This is what we will be talking about in this review.
Fuel pump fuse functions
The Priora fuel pump fuse almost completely determines the performance of the fuel supply system. He is responsible for the fuel injection system using the injection type of gasoline supply. Fuel is supplied using a 12V fuel pump. If the Priora fuse for the fuel pump fails, the car cannot be started. The function of the Priora fuel pump is to suck gasoline from the tank and supply it through the system to the injector intake manifold. If the fuel supply does not work, then, obviously, there is simply no way to start the engine. If you have problems with the engine, the first thing you need to do is check the fuse for the Priora fuel pump. The performance of the fuel pump completely depends on the electronic control system of the car. When the ignition is turned on, an electrical signal is sent to the fuel pump, which starts to move and creates the necessary pressure to constantly supply fuel to the engine. After turning the ignition key to the “start” position, the fuel pump begins to supply gasoline.
If the key is not turned to the start position, the fuel pump turns off after 2 seconds. Obviously, on a Priora, the fuse for the fuel pump is a buffer that takes on the full power of an unauthorized electrical discharge during abnormal operation.
Let's look at the principle of operation of the fuel pump fuse. The design of this element consists of two aluminum contacts and a fire-resistant plastic cover. If it fails at high voltage, the shell melts, which is considered a definite marker for fuse replacement. Between the aluminum contacts there is a contact thread, which can only conduct a normalized current. For example, when marked “15A”, the current with constant amplitude cannot be higher than 15A. When large currents pass, the filament breaks and the body melts.
Relay and fuse box Lada Priora
If we are talking about the failure of some element of the electrical equipment of the system, the inspection and repair of the car begins with diagnosing the relay and fuse box. This block in Priora is divided into three functional parts, which can be found in the following places of the car:
- The main mounting block is located on the left side near the driver's foot. The drawer opens by turning three locks 90 degrees;
- another fuse box is located near the expansion tank under the hood;
- the additional unit is located on the passenger side near his left foot.
The Priora fuel pump fuse is located in the additional mounting block on the passenger side; on the diagrams of the fuse and relay box it can be found under the designation F3 (15 A). K2 marks the location where the fuel pump relay is located. So, we figured out where the Priora fuel pump fuse is located. Now let's look at its functions.
Reasons for failure of the fuel pump fuse on Lada Priora
Let's take a closer look at the reasons why the fuel pump fuse fails. The performance of the fuel pump is associated with the following elements of the fuel system:
- on-board computer;
- the relay is designed to adapt high currents at the moment of starting the fuel pump, protecting against combustion, thus, a malfunction of the relay leads to a malfunction of the fuel supply;
- fuse located next to the relay.
The relay is easy to change. To do this, you need to unscrew its fastening in the additional compartment and replace the part with a new one. So, on the Priora we found out where the fuel pump fuse is located - in the additional compartment near the fuel pump relay. The main function of a fuse is to protect an electrical circuit. When high currents occur, the fuse trips and the circuit opens. Thus, the functionality of all other elements of the system is maintained. Protection can work at any time. The reason is usually current surges or overheating. In general, if the fuel pump fuse fails on a Priora, it protects the on-board computer from power surges.
Replacing the fuse
If it fails, the contact will have to be replaced. Look where the Priora fuel pump fuse is located and carry out a simple replacement. It is worth noting that different brands of cars have different types of fuses. They are a small connector that can be installed without additional fastening. Replacing it, if you have experience, takes no more than 5 minutes with the opening of the edema of the additional power supply unit. If problems arise with the ignition, it is better to immediately inspect the relay and fuse box; with prolonged exposure to high currents, you may encounter the problem of “socket melting,” which may require more complex repairs.
DIY step-by-step repair
If you decide to figure out for yourself why the cigarette lighter is not working and repair the breakdown of your car, then below are the repair instructions.
For this you will need:
- gloves;
- new fuse;
- soldering iron;
- Screwdriver Set;
- tweezers.
Advice! It is not always necessary to go to a car service center. If you understand your car at least a little, then with the help of hints you will figure out why this or that part in the car does not work.
Procedure:
First of all, you need to turn off the power to the car to avoid a short circuit. To do this, remove the negative terminal from the battery; Often the cigarette lighter is located on the center console. Move the driver's seat to get closer to the inoperative device; Using a flashlight, you need to inspect the device socket for the presence of foreign objects. If there are any, then use tweezers to remove them from the socket; If the device does not work, then the first thing you need to do is check the fuse. Due to its burnout, current stops flowing to the device. The instruction book will help you in your search. If necessary, replace it and check again whether the device works; if the problem is not solved, then you should remove the cigarette lighter using pliers
Usually it sits tightly, so you need to make a little effort, but do everything carefully and not harshly, so as not to damage the rim and wires; Pay attention to the appearance of the device. There should be no dark soot on it
Check the wires for integrity; all connectors should be seated tightly; if you find a soldered wire, then solder them using a soldering iron and do not forget about good insulation; then assemble the device and test it for functionality.
Fuel pump fuse in a car
Diagnosis and replacement of the fuel pump fuse
As you know, for proper operation of a car engine, a certain pressure in the fuel system must be ensured. This function is provided by the fuel pump. The fuel pump is far from the most complex device in a car, but its correct operation largely depends on the function of the car. Unfortunately, like any vehicle device, the fuel pump tends to malfunction. In most cases, there is no need to purchase a new fuel pump. There are many reasons why a device may not work properly. To carry out independent diagnostics and restore the vehicle's performance, it is necessary to understand how the fuel pump functions and what factors can reduce its productivity. If the car stalls for unknown reasons or does not start at all when the battery is fully charged, one of the possible reasons is a breakdown of the fuel pump.
Signs of a faulty fuel pump
The primary sign of a malfunctioning gasoline compressor will be the inability to start the car. Of course, if a car does not start, there may be many reasons, but often the problem is a malfunction of the fuel pump. First, you need to check the spark plugs, which if excessively clogged will not produce a spark. Also, incorrect operation of the gasoline pump will be indicated by unstable or abnormal pressure in the fuel system. If the pressure in the system is more or less than required, the car engine will begin to operate unstably. One of the most common problems occurs with the fuel pump signal. It is necessary to understand that the causes of pump malfunction may be secondary factors, for example, wiring.
If the signal from the ignition does not pass to the fuel pump, the cause is probably a wiring fault. In this case, you will have to check the serviceability of the necessary conductors using an electrical measuring device. Incorrect engine operation.
If the engine stalls, fuel combustion in the system does not occur correctly; one of the reasons may be a faulty fuel compressor.
Unstable engine operation at idle
This consequence most accurately indicates that the pump is not working properly or the fuel filter is clogged. Some car enthusiasts, when these problems occur, resort to completely replacing the fuel module. As a rule, if the fuel pump breaks down, the module itself remains operational. Therefore, before you begin replacing a fuel system element, it is necessary to conduct more detailed diagnostics. After all, elements of the power supply system can also be the cause. The most common ones are:
- The fuel pump fuse is damaged.
- The fuel compressor power system relay is faulty.
- Incorrect mass fastening.
- The gasoline pump drive is faulty.
- The seal of the fuel pump contacts is damaged.
The occurrence of one of the above reasons inevitably leads to a malfunction of the pump. As you know, the fuel pump is an important component of the fuel system; if it breaks, the supply of the fuel mixture to the carburetor is disrupted. Therefore, we will analyze each component and the reasons for its malfunction in more detail.
Pressure system
The fuel pump creates optimal pressure in the fuel line. If the pressure in the system decreases or increases, the engine will not operate correctly. Therefore, one of the diagnostic stages will be to measure the pressure in the system. To do this, connect a pressure gauge to the pressure fitting. When the gauge needle slowly increases, the cause may be a clogged fuel filter. If the arrow is in the zero position when you press the gas pedal, the fuel pump itself may be faulty. Similar indicators of the device when the ignition is turned on indicate incorrect operation of the regulator.
Wiring
The fuel pump wiring includes three main wires: fuel level indicator, positive and negative terminals. If there is a power failure, the fuel pump will refuse to function. Therefore, if the pressure diagnostics brought positive results, we proceed to checking the contacts. To begin with, it is necessary to carry out a visual diagnosis of the conductors. If no external damage is found, it is necessary to check the contacts with an electrical measuring device.
Compressor motor
If checking the pressure and contacts does not show a malfunction, you need to pay attention to the pump drive. The motor is the main element for ensuring fuel circulation. If the motor terminals are clogged, the movement of fuel through the system will stop.
Weight
If the gasoline level sensor shows unreliable results, let's see what state the mass is in. If the fastening is insufficient, fuel will also stop circulating through the system. The mass is fixed in the area of the hand brake. If the wires were subjected to mechanical stress, the mass could simply fall off. It is not difficult to install the mass in place. To do this, it is necessary to remove the handbrake shell and secure it to its original position.
Relay
The pump relay is located under the instrument panel. When the ignition is turned on, the relay creates the necessary pressure to turn on the fuel pump and turns off. Correct operation of the relay is accompanied by a characteristic sound. To check, you need to remove the bottom panel, under which there are three relays. The lowest one is from the fuel pump. If when you turn on the ignition we hear a characteristic click, the relay is working properly. If there is no sound, the contacts are damaged or the fuel pump relay itself is faulty. In this case, it is necessary to replace the damaged element.
Fuel pump fuse
The final, but no less important stage of diagnosis is checking the fuse. The fuse, like the relay, is on the inside. You can also get to the fuse from the outside (from under the hood). Opening the hood, you can see a small box on the engine control unit. It is necessary to open the small block and find the fuse, which is located at the very top. The fuse current should be fifteen amperes. We remove the fuse and perform visual diagnostics. If the element contacts are intact, the fuse is working. Damaged contacts indicate a faulty fuse. A damaged fuse cannot be repaired and must be replaced. The item in question is quite easy to find and is inexpensive. If the unit is disassembled, installing a working element is quite simple. By checking the operation of each component, you can identify the cause of the pump’s malfunction and restore the function of the car yourself. Happy renovation!
Description for Renault Kanga 2nd generation
Communication block
It is quite difficult to get to it. To do this, you need to remove the battery, unscrew the cover of the unit next to it and turn it over.
Scheme
Description
| 1 | 7.5A - Fuse for right side light bulbs (172-226) |
| 2 | 7.5A - Fuse for left side lights (173-227) - right rear light (172) - middle license plate lamp (1324) cigarette lighter (101) - socket for additional equipment of the 1st row of seats (506) - door lock and emergency switch alarm (1391) - headlight range control switch (562) - climate control panel (319-419) - audio system (261) - multifunction display |
| 3 | 10A - Right headlight fuse (low beam) (226) - headlight range control switch (562) - right headlight range control motor (538) |
| 4 | 10A - Left headlight fuse (low beam) (227) - left headlight leveling motor (537) |
| 5 | 20A - Fuse for right and left fog lights (176-177) |
| 6 | 10A - Left headlight fuse (high beam) (227) |
| 7 | 10A - Right headlight fuse (high beam) (226) |
| 8 | 25A - ECU of the anti-lock brake system (118) or trajectory stabilization system (1094) |
| 9 | 30A - Windshield wiper motor fuse (212) |
| 10 | 5A - Fuse “+” after the ignition switch of the electric power steering (1232) |
| 11 | Not used |
| 12 | 20A - automatic transmission ECU (119) |
| 13 | Not used |
| 14 | 15A Car with a gasoline engine: injectors 1-2-3-4 (193-194-195-196) – adsorber (371) – lower oxygen sensor (242) – upper oxygen sensor (887) or Car with a diesel engine: supply regulator fuel (1105) – cylinder sensor solenoid valve (746) |
| 15 | Not used |
| 16 | 5A - automatic transmission ECU (119) |
| 17 | 7.5A - Auxiliary heater relay 1 (1067) - Auxiliary heater relay 2 (1068) - Diagnostic connector (225) - Airbag/seat belt pretensioner ECU (756) - Parking assist ECU (1222) |
| 18 | 5A - Fuse "+" after the ignition switch, water in fuel sensor (414) - relay unit in the engine compartment 2 (1683) - injection computer (120) |
| 19 | 10A - Fuse “+” after the ignition switch of the reverse light switch (155) or the reverse light switch with top dead center sensor (1109) |
| 20 | 20A -Injection computer (120) |
| 21 | Not used |
| 22 | 10A - Fuse for the electromagnetic clutch of the air conditioning compressor (171) |
| 23 | 30A - Heated rear window (200) - outside rear view mirrors (239-240) |
Power supply circuit block
Scheme
Purpose
| 1 | 60A Coolant Heater Interface Unit |
| 2 | 7A Diesel engine glow plug relay unit (980) - coolant heater interface unit |
| 3 | 30A Relay block in the engine compartment 2 (1683) – heating element of the fuel heater |
| 4 | 40A Door Power Window Motor Fuse |
| 5 | 70A Fuse and relay box in the passenger compartment |
| 6 | 50A ABS ECU (1094) |
| 7 | 40A Additional heating relay 1 |
| 8 | 70A Fuse and relay box in the passenger compartment |
| 9 | 70A Additional heating relay 2 |
