VAZ 2110 fuel pump does not work - reasons and solutions

Actually, I'm fine. Now. I am writing this post so that people whose working fuel pump suddenly stops working can find it in a search.

I had this problem for a long time, and I suffered for a very long time, and did not know how to eliminate the consequences of this unknown crap, while flipping through a lot of information. And so, this morning, when at minus 35 the car did not start, and I stupidly forgot about this trick, and having drained the battery I almost went to work on a minibus, I again remembered what needed to be done. I'll tell you what the point is. The fuel pump just refuses to turn on. The brain should supply a minus voltage to the fuel pump turn-on relay, but for some reason it does not supply it periodically. Either a glitch in the brain, or a bug in the signaling. But I’m not the only one, and the problem, as it turns out, visits many.

What should we do if the fuel pump does not work when we turn on the ignition?

On the front passenger side we open the side of the torpedo, it is indicated under the number 3

Having opened the hatch, we see 3 pres and 3 relays. Mine is approximately as shown in the photo below. What should I do to make the car move? There are 2 options here:

1. The photo shows the negative contact. You need to pull out the relay a little, attach a wire to the relay contact, and throw it onto the body ground. After that, put the relay in place. What does it give? The fuel pump will start working when the ignition is turned on. I should immediately note that the fuel pump will work constantly. I just don’t recommend leaving the ignition on with this modification, because... You could burn out the fuel pump.

Option 2. Using the same principle, you need to close the positive contacts, they are shown in the photo. This procedure will allow you to start the fuel pump even with the ignition off, and you will be able to get to the service center, or wherever you planned to go.

Do not forget, after you have reached the place, to delete the modification data, because... I recommend using them only in emergency cases. Using it “on a regular basis” may not be safe and may lead to unpleasant consequences.

Scheme

The fuel pump circuit is not particularly complicated. In fact, the unit is an ordinary electric motor, powered by 12 volts from the car’s on-board network. The problem is that getting to it is not easy - you will have to disassemble half of the interior.

The fuel pump is mounted directly on the tank body. The inlet hole is protected by a mesh - this is a filter that provides rough cleaning of the fuel. This element prevents dirt and solid foreign matter from penetrating into the assembly, so its characteristics remain stable.

The electrical circuit includes:

• control module;
• ignition unit;
• wiring;
• fuse;
• relay.

All 2110 models that left the assembly line before 2000 have mechanical fuel pumps. Its components are:

• frame;
• top cover;
• return spring;
• two valves;
• a pusher equipped with a diaphragm.

Power is supplied to the fuel pump in the 2110 model after turning the key in the ignition switch. Voltage is supplied first to the relay. It closes and the unit begins to pump fuel. When the hoses are full, the on-board computer turns off the current. The engine is cranked by the starter and starts.

An important point is that detailed pinout of the fuel pump is not required when troubleshooting a fault, since most often easily replaceable standard elements fail.

Master node of the system

The VAZ-2110 fuel pump is equipped with an electric drive. Its body is lowered into the fuel tank. Gasoline is both a pumpable fuel and a coolant. It should be remembered that traveling with an empty tank is fraught with overheating of the VAZ-2110 injector fuel pump.

This electrical device is an independent unit. Accordingly, its operation does not depend on the state of other mechanisms. A necessary condition for rotating the VAZ-2110 fuel pump rotor is maintaining normal voltage on the on-board network.

The voltage comes through the ignition switch. When the key is moved to position 1, the circuit is closed to turn on the drive. The VAZ fuel pump fills the fuel rail. The engine is ready to start.

If symptoms of poor fuel system performance occur, the pump should be checked. We list the signs that make it possible to replace the VAZ-2110 fuel pump:

• the car is malfunctioning;
• accelerates poorly;
• twitches while driving;
• won't start at all
• gasoline does not flow to the ramp.

First of all, a hearing test is performed. After turning the ignition key to position No. 1, there should be a noise under the rear seat. The sound lasts for a couple of seconds. This means that the pump has pumped up the required pressure.

The fuel pump does not work - what could be the reason?

In the mechanical version there are many moving parts, which causes wear on the fuel pump. Most often, failure occurs due to:

• damage to one or both valves;
• destruction of the diaphragm;
• body deformation.

Very rarely, fuel corrodes the gasket - this happens if it has a manufacturing defect.

When the diaphragm begins to let air through, the pump cannot work well - the fuel enters the crater with oil, which is manifested by a sharp increase in its consumption. The engine itself starts unstably (especially when warm).

It is not difficult to make sure that the diaphragm is corroded to holes. Remove the dipstick from the crater and bring a lit match to it - the gasoline will immediately ignite.

Mechanical pumps also often break due to deformation at the points where the unit is attached to adjacent elements of the fuel system. This is indicated by oil leaks at the joints.

The electric pump may not work if:

• the fuse link has blown;
• the relay is broken;
• the wiring is broken;
• The control module has failed.

Frequent breakdowns

A fuel pump malfunction can be caused by: poor quality fuel, clogged fuel filter, simple emptying of the gas tank, or how intensively the vehicle is used. Mechanical damage to internal components due to wear or poor quality of workmanship and materials cannot be ruled out.

Helping the fuel pump last longer is within the capabilities of any car enthusiast who follows a number of rules:

• refuel with high-quality fuel at proven gas stations;
• change the fuel filter in a timely manner;
• periodically clean the gas tank from accumulated impurities;
• Make sure that the fuel level in the tank is sufficient for the system to operate.

The last point is due to the fact that running the pump idle will lead to overheating and failure.

Fuel pump relay and fuse

As soon as the ignition is turned on, the pump motor starts working - this is indicated by a characteristic sound. Complete silence indicates a breakdown.

Thus, the relay protects the circuit from high inrush currents, sometimes reaching 80 or even 300 amperes. The operating principle of this element is as follows: voltage is supplied to an electromagnetic coil, which attracts the armature and closes the contacts.

The relay in question can withstand 30 amperes. Exceeding the specified indicator disables the element (its winding may burn out).

To detect a relay in an injection machine, no pinout is needed - the unit is located in the cabin, under the instrument panel. Remove the housing (unscrew the 2 screws) and you will see three elements. The one you are looking for is exactly in the center.

The location of the fuel pump fuse is to the left of the relay. By the way, it is also capable of burning out, and therefore the test begins with it. Do this:

• pull out the fuse and inspect;
• make sure the block is not broken;
• replace if necessary.

Sometimes the fuse blows right away. This means that the wiring is shorted (the insulation can be corroded by oil, or it can fray due to vibration). If there is no pinout, the required cores are found with a tester.

Also, the fuse-link burns out when the pump motor itself short-circuits.

If everything is in order with the fuse, then the question arises: how to verify that the relay is working. The easiest way is to try to start the car with the block open. A working unit will make a click. When the coil burns out, you will not hear any sounds.

Sometimes the pump may turn on sporadically. This means that the relay contacts are dirty. Proceed as follows:

• unscrew the block into which the element is inserted;
• pull it out (do not touch the wires);
• close the two opposing contacts.

This simple technique will allow you to check the operation of the fuel pump without any pinout. You simply supply power to it, bypassing the relay. If the motor turns on directly, it will have to be replaced.

Tips for motorists

The fuel pump on the VAZ-2110 is of a submersible type, installed in the gas tank located under the underbody of the car, in the rear seat area. When the ignition is turned on, the driver should hear the sound of its operation, since at this moment it raises the pressure in the fuel line of the engine power supply system. The operation of the fuel pump involves an electronic control unit, a fuel pump relay and a fuse that protects the electrical circuit of its activation from overloads.

If, after turning the ignition key to the on position, you do not hear the sound of a running fuel pump for a short duration, then your car’s engine will not start. You need to start looking for the cause of this malfunction by checking the fuse. You need to look for it not in the mounting block, but in the interior of the car. To do this, you will have to unscrew a couple of screws on the right passenger side of the front console and remove the plastic shield. In this case, you will see three relays and three fuses standing in front of you.

In the middle of this row there will be a fuel pump relay, and to the left of it there is a fuse that protects the electrical circuits of the fuel pump and injectors. We take it out and check its integrity, and at the same time it is necessary to look at the condition of the contacts in which it is located. If they are oxidized, they need to be cleaned. If the fuse is intact and undamaged, then you next need to replace the fuel pump relay next to it with a known good one, or ask familiar drivers for “ten”, or you will have to purchase a new one.

If in this case the fuel pump does not work, then you will have to check its functionality next. To get to it you will have to remove the rear seat cushion. Underneath it you will see a hatch closed with a metal cover, unscrew the screws securing the hatch and in the resulting hole you will see the upper part of the gas tank, where the gas pump is installed.

Disconnect the wiring harness and try to power the fuel pump directly from the battery. If it works, then the fault must be looked for either in the wires coming from the fuel pump or in the electronic control unit (ECU).

If you install a security alarm on your car, which has a function to turn off the fuel pump, then the positive power wire of the fuel pump is cut and an additional relay is installed in its gap, which, in the event of a break-in, should turn off the fuel pump so that the engine stalls and does not start again. In this case, it is necessary to check this relay as well.

If your actions to eliminate this malfunction do not lead to success, then you will have to contact diagnosticians at a service station, since it is unlikely that you will be able to check the electronic control unit on your own.

How to change filters

The filter mesh often becomes clogged with dirt - this leads to unstable operation of the fuel system. To remove it, the pump does not need to be disassembled, but it must be removed. Next, the mesh will need to be changed or simply cleaned.

First reduce the pressure in the system, otherwise gasoline will spread throughout the cabin. To do this, pull out the fuse, start the engine and let it stall.

Replacing the mesh is done as follows:

• turn off the ignition;
• raise the rear seat;
• remove the hatch (fixed with two screws);
• open the connector with the wires;
• Use a wrench (17 mm) to unscrew the fuel hoses;
• unscrew the nuts securing the pump (8 pcs.);
• remove the plate;
• pull out the assembly (along with the gasket);
• change the mesh;
• Reassemble in reverse order.

Troubleshooting, simple tips for reliable operation of the fuel pump

1. If the VAZ fuel pump does not rotate, then first of all, check the integrity of its fuse and the functionality of the relay by replacing these parts. They are located behind the console panel, below, on the front passenger side. If their condition is satisfactory, to test operation, you need to apply supply voltage to the fuel pump directly. To do this, you need to remove the cushion from the rear seat and open the shield secured with screws. It must be remembered that if a security alarm is installed, the power supply to the VAZ pump will include an additional shutdown relay in case of a break-in.
2. If the fuel pump does not respond to voltage supply or the filter needs to be checked and replaced, then you need to perform the following steps to remove the fuel pump from the fuel tank. To relieve pressure in the fuel lines, the fuel pump is turned off using a fuse and the car is started. After the internal combustion engine has stalled, open the gas tank from the filler neck to relieve the pressure of gasoline vapors, disconnect the negative terminal from the battery (to avoid a fire), disconnect the electrical connector from the pump installation flange on the gas tank, disconnect the connectors of the main gas lines (rubber gas-resistant ring on the line fittings must be replaced), the flange is unscrewed (8 7 mm hex nuts), the rubber gasket is removed and the VAZ fuel pump assembly with float and strainer is removed (a rag is first placed nearby so as not to stain the interior with gasoline). The fuel pump filter is being replaced or cleaned. If the pump breaks down, a new one is installed, since its design is usually unrepairable.

1. At low engine power, the pressure in the fuel supply system is checked. This is done either independently using a purchased kit with a pressure gauge, or by checking at a service station (service station). If the fuel pump pressure is unstable and the return hose is pinched, it is less than 4 atm. then the pump must be removed and replaced. Otherwise, the problem may be clogged injection nozzles or improper operation of the fuel pressure regulator.

It is not at all necessary to change the fuel pump of a vehicle several times to understand the main points of its successful operation:

• driving a car with an empty tank is an extreme mode for the gas pump and ultimately costs much more than banal refueling;
• the gas pump “does not like” questionable gasoline, which also leads to frequent replacement of the filter and the pump itself;
• When replacing a VAZ 2110 fuel pump, you can give preference to imported analogues, whose pressure is higher and whose operation is more stable.

No power supplied

As the pinout indicates, there are 4 wires going to the pump:

• in the center - plus and minus;
• at the edges – fuel level control.

To check whether current is flowing, connect a light bulb (12 V) to the negative and positive contacts and turn on the ignition. If everything is in order, it will flare up. If there is no result, the plus and minus removed from the pump connector are connected in turn to its ground, and then to the relay block.

Next, when:

• the lamp (when the negative wire is connected to ground and the ignition is turned on) blinks, then this contact is damaged;
• the improvised indicator did not flash - there are problems with the plus.

If the wire is installed on the relay and the lamp lights up, there is a break between it and the pump. Disassemble the harness and replace the faulty wire. You don’t need pinouts in this situation either.

When it turns out that it was the pump motor that burned out, it will have to be replaced - it cannot be repaired.

Checking the power supply at the fuel pump terminals

The fuel pump is installed in the tank. To access it you will need to remove the rear sofa cushion, it is not difficult.

The fuel pump is protected by a cover.

Fuel pump power supply.

When the ignition is turned on, there should be a voltage greater than 12 Volts at these terminals.

If there is no voltage, then you need to:

• ring the ground on the body. This is a white and gray wire. It is convenient to check the continuity of the bolt securing the rear seat belt fasteners.
• check the positive contact using a tester, or call it directly from the battery, etc.

Try to “fiddle” the wires; they often fray. The negative wire (ground) is connected to the handbrake bolt.

Check directly

It is necessary to carefully strip the wires and apply power to them. (As in the diagram)

If, when voltage is applied, the fuel pump shows no signs of life, then it is faulty.

Fuel pump diagnostics

If the gas tank is full, the battery is in good condition, the spark plugs are dry and give a spark, and the starter rotates the engine, then the reason is the fuel pump. The most common reason is that after turning on the ignition, there is no power supplied to the fuel pump. In the same way, it manifests itself when the car is moving, when the power is lost and the engine begins to stall. Another important nuance is the supply of the required amount of fuel.

The pump may be working, producing a hum and buzzing, that is, power is supplied, but not producing the required pressure.

The pressure in the fuel system with a working fuel pump is considered normal to be more than 3 bar. This pressure is collected in the fuel rail and corresponds to a value of 300 kPa. To check the condition, you need to take a pressure gauge and measure the pressure in the fuel rail, taking into account those indicators that are considered normal for each individual model.

For a VAZ-2110 with an injector, the pressure at the moment the ignition is turned on should show no less than three atmospheres, at idle speed - 2.5, and when the gas pedal is pressed - from 2.5 to 3 atmospheres. This method allows you to accurately determine:

1. Failure of the rail pressure regulator.
2. Fuel pump malfunction or decreased performance due to wear.
3. Severe contamination of the filter or mesh.

A decrease in pressure leads to the fact that the engine does not start or starts with difficulty, it begins to stall, and dips appear during operation. If the pump is to blame, then the fuel pump coarse strainer may be clogged. In this situation, there is no need to change the entire unit; you can clean the mesh or install a new one. If you suspect that the fuel pump is not receiving power, you need to turn on the ignition and listen. A slight buzzing or hum should be heard when the fuel pump is operating. And if you don’t hear anything, then there is a problem with the operation of the fuel pump or the wiring to it.

The main list of reasons why the fuel pump on a VAZ-2110 car does not pump includes:

• fuse malfunction;
• non-working relay;
• motor failure;
• oxidation of contacts in the wiring leading to the fuel pump;
• fuel pump failure.

How to check the fuel pump of a VAZ 2110

When the driver of a car with an injection engine turns on the ignition, the electric motor begins to function and a specific buzzing sound is heard. If no sounds are noted, then the fuel pump is not pumping fuel.

Another characteristic failure of the electric fuel pump is that fuel is being pumped, but the operation is accompanied by loud noise. If the fuel pump is noisy, this is a clear sign that this device will not “live” for long and will soon fail.

Wiring

On almost all car models, the wiring to the fuel pump consists of three wires: “positive”, “negative” and a wire for determining the amount of fuel in the tank.
If the fuel pump stops pumping, the wiring may be damaged. You can check the power using a 12 W lamp, powering it from the external connector of the fuel pump. When the ignition is turned on, the light should light up. If not, then the external circuit is broken somewhere. To check the external wiring, you need to connect in turn the “positive” and “negative” contacts removed from the fuel pump power connector. It is necessary to close the “negative” contact to ground, after which the light will light up when the ignition is turned on. So, it can be determined that the contact is inoperative. If the lamp does not light up, then the “positive” contact is damaged. Placing a contact on the relay in which the light does not light up, there may be a problem with the wiring in the section from the relay to the fuel pump.

Electric motor

If searching for a problem in the fuel rail and wiring does not produce results, you need to check the fuel pump motor. It is responsible for circulating fluid in the internal part of the fuel pump. When checking, it is necessary to take into account that after a certain period of time the terminals on the fuel pump may oxidize and there will be no power. This is also often the reason why the fuel pump stops working. This means that the motor is most likely working, but the terminals need to be cleaned and tightened.

Relay

Next to the ground, under the dashboard, there is a fuel pump relay.
After turning on the ignition, the operating relay allows the pump to create the required pressure in the system in a few seconds, after which it turns off. When you turn the key in the ignition, you can hear a soft click, which means that the fuel pump relay is turned on, and exactly the same when it is turned off. If the relay does not make a click, then the problem is in it or in its contacts. Then it is advisable to replace it with a new one. When looking for the cause of a non-working fuel pump, you need to check the fuse. It is located under the hood and has a resistance of 15 A. It must be carefully inspected; if it is not working, it should be replaced with a new one. The fuel pump in the VAZ-2110 car is immersed in gasoline for active cooling, and the bad habit of driving a car with a minimum amount of gasoline in the tank can very soon cause the fuel pump motor to become inoperative due to burning.

Purpose of the fuel pump, characteristics and possible breakdowns

The fuel pump is designed for uninterrupted supply of gasoline to the internal combustion engine (ICE) of a car. Since, depending on the gasoline supply system, cars are divided into carburetor and injection, then, accordingly, the VAZ 2110 pump comes in two types: mechanical and electric. The mechanical fuel pump is unpretentious, repairable and does not cause any special problems in operation, but currently does not meet the parameters of environmental friendliness and efficiency.

Current requirements are met by injection injection, which is helped by the VAZ electric fuel pump. It supplies gasoline to the internal combustion engine through high-pressure injectors, which makes it easy to dose fuel, reducing consumption and increasing engine power. The main characteristic is the pressure of the fuel pump, which can range from 4 to 7 atm.

Due to changes or lack of pressure, the car engine runs intermittently, does not start, and thus causes concern at the most inopportune moment. At the same time, by showing restraint and using the recommendations presented here regarding the repair of a VAZ fuel pump, you can correct the situation in a short time.

The main signs of improper operation of the VAZ 2110 fuel pump are as follows.

1. Absence of the rotational hum of the fuel pump (it is located in the gas tank under the rear seat) at the initial moment of starting the internal combustion engine (the key is in the ignition position). The reasons may be the failure of the VAZ fuel pump itself or loss of power to it.
2. The appearance of uncharacteristic operating noise can be observed when the gasoline tank is empty and when the fuel filter is severely clogged.
3. Low power of the internal combustion engine (driving only in 1st or 2nd gear) is typical for the fuel pump, with which the car has traveled more than 90 thousand km. Due to actual operating conditions, the service life of the VAZ pump is reduced, and this is manifested in a weakening of pressure.
4. The car's jerky movement indicates that the pressure in the fuel pump system is changing, which is usually a consequence of a clogged filter.

If the type of fuel pump malfunction is determined, it is worth finding the cause to eliminate the problem.

How does a modern pump work?

The carburetor has been replaced by a modern, more reliable injector, so many owners of even the first ten cars are now trying to modernize their cars by removing the carburetor. And they do it right! But along with the injector, some other systems also need to be replaced.

Carburetor cars use a diaphragm pump to pump fuel when the engine is running. In the same place where the injector is installed, the electric fuel pump turns on, creating the necessary pressure even before the engine starts.

Fuel pump operation diagram

That is, it is powered by a battery. If an injector is installed on the VAZ 2110, then the performance and economy of the car is incomparably higher.

For an electric fuel pump, all the data that allows it to operate correctly is supplied from the computer. But, as you know, perfect units, like a perpetual motion machine, do not exist, so from time to time the pump on a VAZ 2110 (injector) needs to be disassembled in order to repair it.

Fuel system design

Model selection

It is best to install an imported fuel pump on the VAZ 2110 injector, capable of delivering a performance of up to 7 atm. It will not only last much longer, but will also ensure better and longer operation of the injector and improve the quality of the mixture at the outlet of the nozzle.

You should know that Bosch fuel pumps usually differ only in length, location of terminal connectors, and sometimes in the diameter of the housing. Therefore, it is advisable to either go shopping with an old device, or make some minor modifications at home.

Bosch fuel pump

To avoid buying a fake, keep in mind that any Bosch gas pump is packaged in very durable packaging. The bag contains purified gasoline in which the device is immersed. If you smell it, it means the seal is broken, corrosion may begin inside the pump, it’s better not to buy one.

Why is it acting up?

Let's look at the main faults.

1. The main, most common reason that the fuel pump makes a loud noise and does not cope with its functions is the filtration system, which includes fuel filters, as well as a special mesh that is located inside the fuel pump. You can suspect that the culprits are here based on the following signs: • your fuel pump is buzzing much louder than usual. Moreover, you need to listen to it exactly when it starts, immediately after turning the ignition key. When the engine starts, you are unlikely to hear the pump humming, because it will be joined by the sounds of a running engine. In addition, you should know that the VAZ 2110 fuel pump hums loudly on its own, and its noise is drowned out by the fuel in the tank where it is located. Therefore, when getting into a car, you should not immediately turn on the music, but listen to how all its systems work; • failures occur in engine operation, which also indicates that fuel is supplied intermittently due to contamination of the filtration system; • These same faults are indicated by a drop in power. Most likely, the mesh is clogged with microparticles of various dirt, which enter the gas tank along with the fuel, or are formed there due to condensation and corrosion processes.
2. The clearances available in the supercharger have been increased. A strained sound may indicate this malfunction. You can hear it working under load. In addition, power drops; the VAZ 2110 (injector) has poor throttle response. Gaps increase for several reasons. In winter, condensation may crystallize; in summer, the density of the fuel decreases, causing the fuel pump to cool and lubricate less well. Both provoke the formation of scratches, cavities, and grooves, due to which the gaps increase;
3. The fuel pump suddenly stops due to the supercharger wedge, as a result of which the fork that connects the supercharger and electric motor shafts breaks. This blows the fuse. The ignition should be turned off immediately. There is a concern that when the pump stops and the current increases, the gasoline may ignite;
4. In addition, a malfunction of the electronics transmitting signals to the fuel pump cannot be ruled out. Before you begin repairing it, you should check the reliability of all connections and wiring.

Causes of malfunction

During operation, VAZ 2110 car owners may encounter some difficulties associated with this element. Malfunctions of the VAZ 2110 injector fuel pump can be as follows:

• element failure due to breakdown;
• a dirty tank or low-quality gasoline with foreign inclusions that contaminate the pump filter.

The very first sure indication that the VAZ 2110’s fuel pump is faulty is the following symptom: the engine “jerks” during operation , especially at medium and high speeds . This indicates that the fuel pressure is insufficient. But this is precisely what the fuel pump is responsible for. But sometimes the reason should be sought in the injectors , as well as the RTD.

Repair work

On a carburetor VAZ 2110 it is easier to replace the fuel pump if necessary. It is located under the hood and is not difficult to get to. It is enough to disconnect the pipelines, then unscrew the pump itself.

The electric fuel pump installed on an injection machine is located directly in the gas tank, so it is more difficult to get to it; this is done from the passenger compartment by removing the rear seat.

All fuel pumps are dismountable. After removing the cover, the mesh is removed and its condition is assessed. Of course, you can wash it, but it’s even better to replace it right away. Before starting repairs, you should purchase a repair kit, which must be equipped with a mesh.

Installing a new

Installation of a new electric fuel pump is carried out in the reverse order.

The following actions are performed sequentially:

1. The seal is installed.
2. The new pump is carefully inserted.
3. The pressure ring is installed and 8 fastening bolts are tightened.
4. The fuel lines are screwed on.
5. The power supply is connected to the connector.
6. The hatch cover is installed and closed with the folded carpet flap.
7. The rear seat cushion is installed.
8. The battery terminals are connected.

When installing, remember that the arrow stamped on the housing must be directed backwards.

Features of the injection power system

The tasks of fuel pumps in carburetor and injection engines are somewhat different. If for a carburetor engine it is important to simply supply gasoline to the carburetor, then for an injection system this is not enough. The fuel pump must not only pump fuel from the tank to the ramp, but also create a certain pressure, without which the engine simply will not start.

Access to the fuel pump in injection cars is also complicated by the fact that in cars of recent years of production it is mounted together with a fuel receiver and a coarse filter directly in the gas tank. This complicates the diagnosis, repair and maintenance of the entire fuel module, but simplifies the design of the pump, since the gasoline itself lubricates and cools it. But this is precisely what often leads to unit breakdowns.