How to change the fuel pump on a VAZ 2114, diagnostics and replacement

The frequency of replacing the fuel pump on Samara 2 (VAZ 2113,14,15) cars is not regulated. Change it only if necessary.

It is quite easy to understand that the fuel pump is faulty. If the car does not start, or starts and immediately stalls, in this case, the first thing you can do is listen and understand whether the pump is pumping or not. Usually the sound of a running fuel pump is heard in a car.

If there is no sound, then you must first check the fuse and relay (it is located at the bottom right of the center console), and then only climb into the tank. It's another matter when the pump is still running, but pumping little fuel. In this case, you will not be able to check the pump yourself without special tools.

When the car begins to pick up speed poorly, drops in speed when you sharply press the gas pedal, or simply has unstable engine operation, you need to check the pressure in the fuel rail. If the pressure is less than 2 bar, the pump must be replaced.

The normal pressure of this fuel pump is 2.5 - 3.5 bar.

Models of fuel pumps for VAZ 2114/2115 cars

VAZ 2114/2115 cars are equipped with 1.5 cm3 and 1.6 cm3 gasoline engines with a distributed injection system. A submersible electric fuel pump is used to supply fuel. It is part of the fuel module installed at the top of the gas tank (under the rear seat). In addition to the pump, the module includes a fuel accumulator (cup), a coarse filter and a fuel level sensor with a float.

To supply fuel in VAZ 2114/2115 cars, a submersible electric fuel pump is used

The VAZ 2114/2115 fuel pump is a conventional DC electric motor in a sealed housing with a one-way valve at the outlet. An impeller of a special shape is located on the electric motor shaft. Its rotation ensures the fuel supply.

The fuel module includes a fuel pump, a fuel accumulator, a coarse filter and a fuel level sensor

The fuel pump is powered from the vehicle's on-board network. The electrical circuit of the pump, protected by a fuse, is closed using a separate relay.

Electric fuel pumps for VAZ cars are produced by both domestic (Utes, SAAZ, Pekar) and foreign companies. The latest modifications of the VAZ 2114/2115 are equipped with BOSH pumps, which are distinguished by their high reliability, long service life and relatively low price.

Design of the electric fuel pump VAZ 2114/2115

Catalog numbers of standard fuel pumps for VAZ 2114/2115:

2112–1139009–12 — for engines with a volume of 1.5 cm3;
2112–1139009–01 — for engines with a volume of 1.6 cm3;
580453453 (BOSH) - for engines with a volume of 1.5 and 1.6 cm3.

These models differ in operating pressure. The former are capable of creating a pressure of 2.8–3.2 kPa in the fuel system, the latter - 3.7–3.9 kPa. BOSH fuel pumps are rated at 3.5 kPa.

Removing, installing and replacing the fuel pump

The first thing to keep in mind is that all work on the car’s fuel system must be carried out with the negative terminal of the battery disconnected. It would also be a good idea to do this with an empty fuel tank, especially since with the fuel module removed it becomes possible to clean the bottom of the gas tank from sediment.

The second thing it is advisable to do is to remove the pressure inside the fuel lines so as not to get a stream of gasoline in your face or into the interior of the car. This can be done using a measuring nipple on the fuel rail and a thin screwdriver.

To work you should prepare:

curved and flat screwdrivers
key for 17
head for 7
rags

Sequence of work

Raise the rear sofa.
We unscrew the two screws that hold the cover that blocks access to the fuel module, and disconnect the electrical connector from it.
Using a 17mm wrench, unscrew the two fuel lines connected to the pump, being careful not to lose the O-rings, and move them to the sides.
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Newer models have clips on the pump; to remove them, press them and pull the tubes towards you.
Using a 10mm socket, unscrew the 8 nuts that secure the pressure plate in a circle, holding the entire fuel module.
Carefully remove it through the hole in the gas tank, having first released the fuel level sensor float.

If there is a new assembled module in stock, install it in the reverse order. If it is necessary to replace individual components: the fuel pump itself, the level sensor or the primary filter mesh, we do this by disassembling the fuel module housing and removing the corresponding parts.

This procedure is unlikely to cause any difficulties - everything is quite obvious.

For a new type of fuel pump, you need a 10mm socket and a ratchet, similarly unscrew the ring in a circle and press out the fuel line clamps.

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Symptoms of a problem

A malfunction of the fuel pump of VAZ 2114/2115 cars can be diagnosed by the following symptoms:

when the ignition is turned on, there is no sound of the pump running;
the engine does not start or starts with difficulty;
the power unit is unstable at idle, the speed “floats”;
“dips” appeared during acceleration;
the motor has lost power.

The same signs also appear when other elements of the fuel system malfunction.

Before you begin diagnosing or replacing the fuel pump, you should make sure that:

the fine fuel filter is not clogged (it is changed every 7 thousand kilometers);
the injectors and fuel pressure regulator are operating normally;
The sensors for mass air flow, throttle position, and oxygen quantity are working properly.

If the detected malfunction is accompanied by the lighting of the “CHECK” lamp on the dashboard, you should set the error code and decipher it.

Diagnostics

A malfunction of the VAZ 2114/2115 fuel pump can be caused by:

malfunctions in the device’s power supply circuit;
failure of starting and protection elements (relay and fuse);
wear of electric motor parts.

Checking the electrical circuit

At the beginning of the diagnosis, you should check the electrical circuit of the fuel pump. To do this you will need:

car tester (multimeter);
crosshead screwdriver;
two pieces of wire about 2 m long.

Checking the electrical circuit

At the beginning of the diagnosis, you should check the electrical circuit of the fuel pump. To do this you will need:

car tester (multimeter);
crosshead screwdriver;
two pieces of wire about 2 m long.

Checking the electrical circuit is carried out in the following order:

Turn on the ignition without starting the engine. When the key is in the first position, a click should be heard, characteristic of turning on the relay, followed by a slight whirring of the pump electric motor. If there is no click, the relay is faulty or is not receiving power. If there is a click, but no buzzing, the wiring coming from the relay or the pump motor itself is faulty.
Under the glove compartment, find an additional mounting block consisting of three relays and three fuses. The pump relay is located in the middle, and the fuse is located to the left of it. Remove the fuse from its socket, test it with a multimeter, and if the result is negative, replace it. When replacing the fuse, please note that it is rated for a maximum of 15 A.

The relay and fuse for the fuel pump on the VAZ 2114/2115 are located in the mounting block under the glove compartment.

Set your multimeter to voltmeter mode. Connect one probe of the device to the relay terminal to which the pink wire fits, and the second to the car body. Turn on the ignition. The device should show the on-board network voltage in the range of 11.7–12.4 V. If there is no voltage, the problem may be a broken wiring or a malfunction of the ignition contact group. In this case, it is better to contact an auto electrician. If power is supplied, check that the relay is working. With the ignition on, use a screwdriver or a piece of wire to close the contacts to which the pink and gray wires go. This closes the circuit bypassing the relay. If the fuel pump works, replace the relay.
Be sure to check the connection of the pump's negative wire to ground. Often it is the lack of “ground” that causes interruptions in the operation of the fuel pump. Remove the plastic trim from the center console near the parking brake handle. Under it there is a “negative” wire of the pump, screwed to the body with a self-tapping screw. Unscrew it, clean the contacts, screw it back and repeat the test.

The ground wires of the fuel pump are attached to the body with a self-tapping screw

Then check the fuel module. Remove the rear seat, peel back the carpet and sound insulation. Unscrew the two screws securing the gas tank flap and disconnect the electrical connector on the fuel module cover. Using two wires, supply power to the pump directly from the battery. If the pump works, the wiring is faulty; if it doesn’t work, the pump itself is faulty.

Selecting and replacing the fuel pump

Russian car owners prefer BOSH fuel pumps. You should only buy a new pump in specialized stores. The original product must be packaged in thick plastic film filled with special preservative oil. At the same time, a branded BOSH pump cannot cost less than 2 thousand rubles.

To replace the electric fuel pump on a VAZ 2114/2115 you will need:

screwdriver with Phillips bit;
thin slotted screwdriver;
key or head 7;
key to 10;
key to 17.

The sequence of actions is as follows:

Using a 10mm wrench, remove the negative terminal from the battery.
Open the gas tank cap to reduce the pressure in it.
Remove the rear seat cushion and peel back the carpet and sound insulation.
The fuel module hatch is located under the rear seat
Using a screwdriver, unscrew the two screws securing the fuel module hatch and remove it.
Disconnect the power connector.
Disconnecting the electrical connector from the fuel module
Using a 17mm wrench, unscrew the nuts on the fuel pipes. We disconnect the tubes from the fittings and move them apart.
Using a 17 wrench, unscrew the nuts on the fuel pipes
Using a 7 socket, unscrew the eight nuts securing the fuel module cover.
Using a socket 7, unscrew the eight nuts securing the module cover
Remove the pressure ring and remove the fuel module.
Removing the fuel module from the gas tank
Use a thin slotted screwdriver to disconnect the coarse fuel filter.
Using the same screwdriver, remove the retaining rings on the glass guides.
Using a screwdriver, remove the retaining rings from the guides
Disconnect the fuel pipes from the cap fittings.
Fuel pipes will be easier to disconnect if they are heated
Disconnect the electrical connector.
Remove the glass from the guides.
After disconnecting the tubes and wires, remove the glass from the guides
Using a slotted screwdriver, move the latches securing the electric fuel pump to the sides and remove it.
To remove the fuel pump, you need to move the latches apart
Install a new pump.
Repeat all operations in reverse order.

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If, when disassembling the fuel module, it is discovered that the coarse filter is clogged, it should be replaced. The fuel level sensor with a float must also be replaced if the readings on the front panel do not correspond to reality.

Thus, diagnosing and replacing the fuel pump of a VAZ 2114/2115 car is quite simple. And in order for the pump to serve for a long time, always refuel only with high-quality gasoline.

Pressure check

If the pump is working properly, but the engine begins to operate intermittently, you should check the fuel pressure in the system. For this you will need:

pressure gauge (can be a tire gauge with a measurement limit of 5–7 kPa);
petrol-resistant hose with a diameter of 10–12 mm and a length of 50–80 cm;
two clamps for a hose of the appropriate diameter;
Phillips screwdriver;
nipple cap;
dry rag.

In addition, the presence of an assistant is desirable.

The verification procedure is as follows:

In the engine compartment on the engine fuel rail, locate the pressure measuring fitting (on the right side).
Remove the plastic cap (plug) from the fitting.

Find the pressure fitting and remove the cap from it

Using the nipple cap, unscrew the spool valve from the fitting. When unscrewing the spool valve, fuel may spray out of the fitting. To remove it, use a dry cloth.

When unscrewing the spool valve, fuel may spray out of the fitting.

Place one end of a gas-resistant hose onto the fitting and secure the connection with a clamp. Connect the other end of the hose to the pressure gauge fitting and also tighten the clamp.

Connect the pressure gauge to the fitting using a hose and clamps

Ask an assistant to turn on the ignition. Wait a few seconds and watch the meter readings. If the pump is working properly, the pressure gauge should show a pressure of 2.8–3.2 kPa for engines with a volume of 1.5 cm3 and 3.7–3.9 kPa for engines of 1.6 cm3. If the pressure is noticeably higher, the pump is faulty.

Diagnostics

Pump failure can be caused by two reasons:

Faulty fuel pump relay or blown fuse.
There is a fault in the power circuit.

To check the electrical circuit and relay, do the following:

Turn the key to the ignition position, but do not start the power unit. After turning the key to the ignition position, a click of the relay should be heard and then there should be a brief activation of the pump. If you do not hear a click from the relay, it means it is faulty or there is no power to it. If the relay clicks, but the pump does not work, then the problem is in the wiring that goes from the relay to the pump;
Locate the relay box under the glove box. The block consists of three relays and three fuses for them. The fuel pump relay is located in the center. Remove the fuse, check its integrity and replace it if necessary;

Take a multimeter and set the measurement mode to 20V. Next, touch one of the probes to the contact on the relay where the pink wire is connected. Touch ground with the other probe and turn on the ignition. The screen should display the on-board voltage from 11.5 to 12.5 V. If there is no voltage, the problem will be in the ignition switch contact group or a broken wiring. To test the relay, use a jumper to connect the terminals to which the gray and pink wires go. If the fuel pump starts working, change the relay;
Make sure that the negative wire on the body is not oxidized. Often, interruptions in the operation of the pump are associated with a lack of mass. The ground wire is located near the handbrake mounting bolts;
To check the pump, remove the rear seat and the fuel module cover. Disconnect the power connector on the fuel module and supply 12 V there directly from the battery. If the fuel pump works, the problem is in broken wiring; if it doesn’t work, you need to change the pump;
Also, the pump may not produce the required pressure for the injection system to operate. It is not difficult to measure the pressure yourself, but you need to have several special devices. We recommend stopping by a service station and asking them to measure the pressure of the fuel pump. It should produce 2.8–3.2 kPa for a 1.5 engine and 3.7–3.9 kPa for a 1.6.

Necessary tool

What to do if the pump fails? To dismantle old and install new equipment, you need to prepare the following tools:

Phillips and flat screwdriver;
socket wrench 7;
open-end wrenches sizes 10 and 17.

Before replacing the fuel pump on a VAZ 2114, you need to make sure that it is the problem. To do this you need to do the following:

If when you turn the ignition key you do not hear the noise of the running motor, then use a multimeter to check the power circuit. To do this, remove the fuses from the mounting block (located under the glove compartment) and measure them.

And also “mass”. To do this, remove the lining near the handbrake lever. We find the “minus” of the fuel pump (attached to the car body). Disconnect, clean and put back. And lastly, we check the presence of power directly to the fuel module. It is necessary to dismantle it (located under the rear seat) and connect it directly from the battery.

We check the pressure in the system.

Under the hood of the car we find a special fitting with a cap. We remove it, put a hose on it, and the other end to the pressure gauge. Moreover, both ends must be tightened with clamps. Turn on the ignition and record the instrument readings.

The pressure should be between 2.8 and 3.9 kPa.

If there is no positive result, the fuel pump is replaced with a new one. Let's look at how to replace the fuel pump on a VAZ 2114. We proceed in the following sequence:

The cost of this repair at a car service

The fuel pump on a VAZ 2114 (injector, 8 valves) is easy to change. Many car owners do not want to spend their personal time on such work. The car is sent to a car service center, where experienced technicians will perform the replacement themselves. The average cost of the service in Russia ranges from 800 to 1500 rubles. When replacing the fuel module yourself, you need to show maximum attention and be consistent. To extend the life of your vehicle's fuel system, do not forget to refuel with high-quality fuel and carry out maintenance on time.

Source of the article: https://vaz-2114.info/vaz-2114-zamena-benzonasosa/