After replacing the fuel filter, the car will not start, what should I do? Why the fuel pump does not pump gasoline Replaced the fuel pump does not start

Why after replacements fuel filter Does the car start to start badly?

If you, after replacements fuel filter, the car does not start well, we advise you to familiarize yourself with the main reasons for the appearance of a similar situation, set out in our article.

Harmless problem

Change the fuel filter and the car won't start? Check the size of the new filter device. A slight deviation of up to 0.2 cm in height (not the diameter) of the filter element can be a prerequisite for the appearance of the designated task. Why does the engine start badly after replacing the fuel that the car does not start the pump and. The filter device operates at the highest pressure calculated by the dealer vehicle- the parameter affects the work power unit... The use of an inappropriate filter element will lead to a change in the pressure in the system, the car will stop starting. Why after replacing the fuel filter. After replacing the fuel filter, the car will not start…. You can familiarize yourself with the dimensions that the filter must meet and the sequence of its replacement in the vehicle operation book.

To find out if a new filtering device is causing the motor to start poorly, perhaps as follows:

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1. Take the old filter that you wanted to replace (provided that the body of the device is sealed, the valves are working properly, the O-ring is not damaged).
2. Install this filter element to the vehicle.
3. Check the motor starting frequency.

Draw conclusions: if a car started working fine with the old filter element - the new filter you installed is not the original one. It is analog and not suitable for providing normal work engine of your car. Buy an original filter device for replacement that meets the requirements of your car dealer.

Is the pump defective?

If you chose a fuel filter, according to the requirements of the car manufacturer, corresponding in size, installed it, and the car stopped starting - check the manual priming pump, it may be the cause of an airborne system. After replacing the fuel filter. To solve the problems associated with the specified unit, the following methods will allow:

Poor starting after replacing fuel filter w203 cdi 220 mercedes-benz

air that enters the system after several attempts to start car leaves itself through the return line.

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After replacement fuel filter- engine starts up not ok !!

The engine started well, right the first time.

1. Bleed the pump several times, provided that the unit is in good working order. Will not start after replacing fuel Will not start after replacing The car is before me. In this case, the car will start working normally if the plug was not over the entire section of the pipe.
2. You can get rid of the formed air lock by closing the drains of the filtering device and removing a little volume of fuel from the system using a pear (you can use your mouth). If, after these manipulations, the fuel flows into the return line, the system is vented. Are you having problems after service car? The article will describe, possible problems after replacing the fuel filter, why the car won't start. Hello everyone…. And today we will burn out, what to do if the car does not start after replacing the fuel filter? Otherwise, look for the cause of the depressurization.
3. To obtain excess pressure, remove the hose located between the tank with the filter element and the pump, then supply air to the tank, then quickly reinstall the hose and start the engine. If the problem persists, replace the pump.

Airiness of the system, as well as malfunctions pump manual bleeding is not always the cause of breakdown.

Other reasons

Did you change the fuel filter, after which the car does not start well? Pay attention to the quality of the new filtering device. The fuel filter is consumable requiring periodic replacement. The car will not start after replacing the fuel filter. From quality and design features unit depends on its price. Doesn't the car start badly after changing the fuel car won't start? pump. If you are offered to purchase a filtration element at a reduced price - most likely, this is not an original product, but a fake. Using a poor quality device can damage the motor. For example, the filter curtain will rupture during fuel supply, or its porosity is too large. These factors will lead to a deterioration in the filtration of harmful particles from the fuel, provoke a breakdown of the car engine. After replacing the fuel, the subject is lower and the car will not start and the pump button. Consider diesel fuel filters are more expensive than specified devices for gasoline powered cars. Filtering devices of diesel engines produce not only mechanical cleaning. After replacing the fuel pump, it will not start. After replacement Fuel Machine will not start Replacing the fuel pump c. They prevent water from entering the system, and at sub-zero temperatures provide fuel heating (to avoid the formation of wax crystals).

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Common problems affecting starting the engine after changing the fuel filter.

Hello everyone…. And today we will burn out, what to do if the car does not start after replacing the fuel filter? The article will be useful to everyone who broke his car himself trying to save money on maintenance, regardless of the type of engine and the age of the car.

Bleed fuel system.

The fact is that the fuel filter can have a significant volume (sometimes 0.5 liters) and for a single start, the pump simply does not have time to pump the system. Accordingly, there is not enough fuel and the engine cannot start.

On injection and modern diesel cars it is necessary to open the lock 3-5 times to the "ignition on" position (do not turn the starter) and wait for 5 seconds.

For clarity, watch this video:

On old diesel cars it is necessary to pump the system using the so-called. pears. As a rule, those who drive such cars themselves know all this and are able to, but if you are just mastering old diesel engines with a mechanical injection pump, this video will be useful to you:

On carburetor cars (although they have not been released for 10 years now), it is still easier - we just pump fuel and hoses by pressing the gas pump lever 10-20 times. If the lever does not push, simply crank the engine ½ turn with the starter.

We pumped over the system and are trying to start. If the engine starts, everything is fine, if not, we begin to remember what we did and look for mistakes.

If the filter is external.

As a rule, there are two filters in systems with an external fuel filter! Filter fine cleaning as in the picture above and the coarse filter, it is on the fuel intake in the tank. If you haven't replaced it, replace it. The main problem, the engine does not start, after replacing the fuel filter lies in the hoses! Poor-quality hoses swell, and since they are held on the outside by the braid, they block the inner hole. Until they are moved, they still somehow work, but after replacing the filter (when they are twisted and stretched), they can become unusable in a few minutes. (this is a typical problem with cheap hoses).

It is checked as follows - remove the supply hose from the fuel rail and open the lock to the "ignition" position, do not turn on the starter and do not smoke! If a good stream of gas comes out of the hose, the reason lies not in replacing the filter, see what else you did. If the fuel barely runs, check the hoses (according to science, it is necessary to take a pressure gauge and measure the pressure, but personally I do not have a pressure gauge with an adapter on the farm to check the fuel pressure).

If the filter is composite.

Composite fuel filter with pressure regulator, used on many "large" foreign cars. An important feature of these filters is the built-in fuel pressure regulator. On average, 3% of cheap filters have a defective fuel pressure regulator and after replacing them, the engine does not start.

Same problem may be in swollen hoses, but this is only if if the repair of the car was previously carried out by the "collective farm".

The correctness of replacing the filter is checked in the same way - we remove the supply from the ramp and look at the pressure. (according to science, it is necessary to take a pressure gauge and measure the pressure, but personally I do not have a pressure gauge with an adapter on the farm to check the fuel pressure).

If the filter is installed in the fuel module in the tank.

Fuel modules cost 90% modern cars... The fuel module is an assembly of a pump, fuel filters, pressure regulator and fuel level meter. Such is the thing in itself.

This is the saddest case since, you will probably have to take things apart again... By the way, it is when replacing the filter in the fuel module that most of the jambs come out.

Before disassembling, we check - we remove the feed from the ramp, open the lock and see if the fuel is running and how much of it. (according to science, it is necessary to take a pressure gauge and measure the pressure, but personally I do not have a pressure gauge with an adapter on the farm to check the fuel pressure).

If the fuel does not run, we remove the fuel module and check where we messed up, there are not many options, here they are:

Everything, all the typical problems due to which the car does not start after replacing the fuel filter, I brought. Hope the article was helpful.

Colleagues, that's all for me today. If your car does not start in spite of everything, contact the service. By the way, for large cities, an excellent online service at the choice of a car repair shop.

That's all for me today. If you still have questions, or if you want to supplement the article, write comments.

One of essential elements is an electric fuel pump that is located in fuel tank car. The fuel pump pumps fuel into the system from, creating a certain pressure.

Car repair professionals identify the following common problems fuel system that are associated with the fuel pump:

• the fuel pump does not pump well and does not create the required pressure;
• the gas pump does not pump when the ignition is turned on;

Given that the fuel pump is an electromechanical device, the most popular fuel pump malfunctions are associated with both mechanical and electrical parts. Next, we will consider what signs indicate a breakdown of the gas pump and why the gas pump stops pumping partially or completely.

Read in this article

Signs of malfunctions of the fuel pump

The main symptoms of the failure of the fuel pump, as well as malfunctions in its operation, are:

• the car is difficult to start, the engine is unstable, there are dips, jerks when you press the gas pedal, etc.;
• the pump does not pump after turning on the ignition, and does not pump the gasoline pump, the engine does not start;

Also, there have been cases when the gas pump stops pumping directly in motion. In such a situation, the engine starts to malfunction and stalls immediately after the remaining gasoline in the fuel line is consumed. The problem can occur both regularly and intermittently.

Does not pump the gasoline pump: causes and diagnostics

To begin with, if the gas tank is full, charged, dry and there is a spark on them, 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 supply to the gasoline pump after the ignition is turned on. In a similar way, the malfunction manifests itself in motion, when the power to the gas pump is lost and the engine suddenly stalls.

No less important point is also how much the gas pump pumps. In other words, the pump may hum and hum (power is on), but not create the desired pressure in the fuel line. The pressure in the fuel system with a working gasoline pump must be more than 3 bar (depending on specific model auto). The specified pressure is accumulated in the fuel rail and has an indicator of 300 kPa and above.

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

• malfunction of the fuel pressure regulator in the rail;
• breakdown of the fuel pump or a noticeable decrease in its performance due to wear;
• heavy contamination of filters (fuel filter and / or fuel pump mesh);

In the second case, when the gas is pressed, the pressure does not increase; in the latter case, the pressure gauge needle rises, but very slowly or in jerks.

A decrease in the pressure indicator below the norm will lead to the fact that the motor may not start or start with difficulty, triple, twitch, work unstable 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 cleaning mesh of the fuel pump is clogged. In this case, there is no need, since it will be enough to replace or even clean the mesh.

If there is a suspicion that there is no voltage to the fuel pump, there is a way to quickly check. It is enough to turn the ignition key and listen, because at the moment the key is turned, a slight hum of the fuel pump should be heard. If such a buzz is not heard, then there is no power to the gas pump, there are problems with the wiring, etc.

We add that this method of detecting pump operation by sound is not suitable for all cars. On some models (especially the "premium" class), noise insulation is at a high level and the fuel pump turns on immediately after opening the driver's door, and not when turning the key in the lock. In this case, it may seem that the fuel pump does not work when the ignition is turned on, while
the sound of the pump may simply not be heard.

Also in the general list possible reasons, through which the fuel pump does not pump, are marked:

• failure of the fuel pump fuse;
• breakdown of the fuel pump relay;
• problems with the "weight" of the fuel pump;
• malfunction of the electric motor of the fuel pump;
• oxidation or hall of contacts and terminals of the gasoline pump;
• the fuel pump itself is faulty;

Fuel pump wiring

On most cars, the wiring to the fuel pump consists of three wires: "plus", "minus", as well as a wire for indicating the amount of fuel in the gas tank. If the fuel pump does not pump, then the reason may be lack of power.

To check the power supply to the gasoline pump, it is enough to take a 12-volt light bulb by applying power to it from the external connector of the gasoline pump. After turning the ignition, the control lamp should light up. If this does not happen, then the problem is in the external circuits. Illumination of the lamp 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 pump ground. The contacts must also be connected to the fuel pump relay. If you place a negative contact to ground, after which the ignition is turned on and the light comes on, then this means that this contact is faulty. In the event that the light bulb does not come on, then the problems with the "plus" are obvious. If you place a contact on the relay and the light comes on at the same time, the wire may have been damaged in the section that connects the relay and the fuel pump itself.

Fuel pump electric motor

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

During the check, it must be borne in mind that the terminals on the gas 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.

To believe the fuel pump motor, you need to fasten the wires control lamp to the cleaned and serviceable terminal of the electric motor, after which the ignition should be turned on. If the light comes on, it will indicate that the petrol pump motor is not working.

Fuel pump ground contact

Problems with the weight of the fuel pump may be indicated by a fuel level sensor that does not work correctly. The mass may be poorly secured; in this case, the fuel pump does not pump fuel. The ground wire is usually under dashboard and walks through the cabin. It is necessary to find the indicated wire, check and clean all contacts, then securely fix the mass on the gas pump.

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 build up pressure in the system and immediately turns off.

At the moment of turning the ignition key, the driver hears a characteristic click (the relay has turned on), then a similar click will indicate the disconnection of the fuel pump relay. If such clicks are not heard, this indicates a malfunction of the relay or its contacts. The optimal solution will replace the fuel pump relay with a new or known working device. We add that the cost of the spare part is quite affordable.

Fuel pump fuse

During diagnostics, be sure to check the fuel pump fuse. The specified 15 A fuse is usually located in the fuse box in the engine compartment and is marked FUEL PUMP, which means the fuel pump.

The fuel pump fuse must be pulled out and its contact inspected. The integrity of the contact will indicate that the device is normal. A damaged contact will indicate that the fuel pump fuse has blown. In this case, you need to put a new fuse, which has a very low cost (as in the situation with the fuel pump relay).

Other causes of fuel pump malfunctions

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

Also, one should not exclude the possibility that a failure occurred in the car alarm or security complex, after which the power supply of the fuel pump is blocked. In other words, .

Finally, we add that the gasoline 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 disable the electric motor of the fuel pump, as it burns out.

Read also

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.

It happens that drivers have problems after replacing the fuel filter - the car does not start well. The recommendations below will be useful to people who have rendered a car unusable by saving on components.

Bleeding the fuel system

Let's consider two main options:

1. On injection and modern diesel units, it is enough to turn the key to the ignition position, wait a few seconds without turning the starter, then start the car.

If there is a filter with a large volume, the pump does not have time to pump it with fuel, as a result of which the fuel does not enter the engine. In order to prevent this problem, before cranking the starter, repeat the procedure from the paragraph above several times, turning the ignition on and off with a delay of three to five seconds. This will allow the fuel pump to bleed the system and allow the engine to start normally.

1. If your car is equipped with a diesel engine running according to the old technology, the system is pumped with a blower. Although if you use this type of engine, you are familiar with all its features. But suddenly you are just getting acquainted with such systems - this advice will come in handy.

External

Basically, on vehicles where this system is applied, there are two filter elements. The first, coarse cleaning, serves for cleaning from coarse mechanical impurities. The second, fine cleaning, from the smallest foreign bodies. Better to swap them in pairs.

If, after all the procedures, the car does not start, you should pay attention to the hoses, they are often of poor quality, and swelling are the main reason for the inability to start the engine. Cheap hoses simply become unusable after being disturbed. The braid that holds them on the outside helps the inner opening to close off.

To avoid this situation, it is enough to remove the supply hose from the rail and open the lock to the "ignition" position; the starter does not need to be turned on. If a powerful jet of gasoline flows from the hose, the filter change has nothing to do with it. With a low fuel flow, it is necessary to check the hoses with a pressure gauge by measuring the pressure.

Composite

A characteristic feature of such elements is a fuel pressure regulator built into the mechanism. It is sometimes defective in cheap analogs, which is why the car does not start. The same result is given by swollen hoses, the problem with which is described in the previous paragraph.

Installed in the fuel tank

V this case, most likely, you will have to disassemble everything, but first you need to check something. It is necessary to remove the feed from the rail, open the lock and make sure if the fuel is flowing and in what quantities. If the fuel does not flow, there are several reasons for the problem:

• torn or incorrectly fitted O-ring;
• the fuel hose is not fully put on the pump or filter;
• the pressure regulator will not snap into place;
• the electrical terminal is not attached to the pump.

Other fuel system malfunctions

Defective pump

If the new filter is original, it has correct sizes, and the engine does not start after its installation, then the reason may also be a manual pumping pump, due to which the system was airing. There are several ways to solve this problem.

1. Bleed pump three or more times. If it is serviceable, and airlock is not located over the entire section of the branch pipe, everything should work.
2. In order for the plug to disappear, it is necessary to close the drains of the filtering device and drain some of the fuel using a blower. The system will air out if fuel flows into the return line. Otherwise, the reason is depressurization.
3. To obtain excess pressure, it is necessary to remove the hose that is located between the pump and the filter element, supply air to the tank, put the hose back and start the engine. With the remaining problem, it would be advisable to think about changing the nodes.

Other reasons

• An improperly assembled filter also causes startup problems. It is necessary to make sure that the seals are intact and even.
• If the injectors are incorrectly connected, you need to throw the wires.
• You should also pay attention to candles. Possibility of incorrect installation. You can check this by rearranging the coils, along the way checking their integrity. In addition, the culprit may be black carbon deposits, the appearance of which is associated with incomplete combustion of fuel, as well as incorrect operation of the car's fuel system.
• Wrong location camshafts rare, but can be a source of problems.
• Poor quality fuel is likely to cause a malfunction. This should not be neglected.
• Some fuel filters have plugs by default: they are small and made of transparent plastic, so they are difficult to see. Engine start will be completely absent if not removed.