On VAZ-2115 cars produced in 2000 and later, injection engines are installed, which means that the gas pump located in the fuel tank will be electric. The operation of such a fuel pump is checked every time before starting the engine. Moreover, the driver must do it correctly. When you turn on the ignition, you should hear the sound of the fuel pump turning on for a few seconds. You must wait until this noise stops and only then start the engine. This is done so that the power system has time to pass the test for its serviceability.
If, when turning on the ignition, the driver does not hear the noise of the fuel pump, then you can try to remove the negative terminal from the battery for a few minutes, this is done to reset errors in the control unit, and then turn on the ignition again. If these actions did not help get the fuel pump working, then you will have to remove the cover located on the console at the feet of the front passenger and check the condition of the 15-amp fuse, and at the same time the relay. They are located at the very bottom, of the three relays and fuses that are there.
After making sure that the fuse is intact and the relay is working properly, then you should check whether voltage is supplied to the fuel pump terminals. This can be done using a test lamp by connecting it to the plus (pink wire) and minus (black wire) terminals of the fuel pump connector. There are three terminals in this block; in addition to plus and minus, there is also a terminal (gray wire) for the fuel level indicator.
If, after turning on the ignition, the warning lamp lights up, then voltage is supplied to the terminals of the fuel pump, and the fault will have to be looked for in the pump itself. But, you need to take into account that if the voltage at the terminals is below 12 volts, the fuel pump will not work. Therefore, it is better to check the presence of voltage using a tester. You should also know that some VAZ-2115 cars are equipped with fuel pumps that have four wires in the block, as a result of which the fuel pump control circuit is different.
Owners of cars from the Samara VAZ 2114/2115 family have nothing to complain about: their cars can handle the loads quite well and rarely fail. But in some cases, the problem becomes a breakdown of the fuel pump. This is the most important element of the system, the failure of which can lead to serious problems: the motor simply will not work.
The gas pump (or fuel pump) pumps fuel from the gas tank to the engine. On models 14 and 15 of the VAZ family, the fuel pump is located in the fuel tank. The gas tank is located on the bottom of the car, in the rear. Therefore, in order to get to the fuel pump if necessary, you will need to remove the cushion from the rear seat in the cabin and find a small hatch hidden underneath.
The device is “hidden” under the rear seats, under an inconspicuous hatch in the car body
On cars of the Samara VAZ family (that is, on “fourteeners” and “tags”), “native” factory fuel pumps of the “Saratov” brand are installed. Their performance is average, but in terms of tightness they can let the driver down at any time.
However, their main advantage is their low cost.
Each owner of a VAZ-2114/2115 can easily replace an unwanted fuel pump with a better one. For example, the domestic “DAAZ” or the time-tested “Pekar”.
The production of gasoline pumps is located in Dmitrovgrad
Foreign analogues: QH (England) and OTA (Italy) also fit perfectly into the fuel system of domestic cars, however, their cost is almost three times higher than the price for a Saratov fuel pump. However, unlike domestically produced pumps, QH and OTA products are equipped with only one membrane, but a very thick one. Therefore, when using foreign expensive gasoline pumps, the possibility of fuel getting into the oil is practically excluded.
Pekarov production was opened in St. Petersburg
Table: comparative characteristics of fuel pumps for VAZ 2114/2115
| Fuel pump test results | |||||
| Characteristic | "Baker" | DAAZ | Saratovsky | QH | OTA |
| Zero supply pressure (at a crankshaft speed of 2000 rpm), kgf/cm2 | 0,26 | 0,28 | 0,26 | 0,3 | 0,36 |
| Capacity for free drainage (at a crankshaft speed of 2000 rpm), l/h | 80 | 76 | 73 | 92 | 74 |
| Suction period at crankshaft speed 200 rpm, s | 4 | 13 | 12 | 9 | 6 |
| Valve tightness at a pressure of 0.3 kgf/cm2 (fuel leakage within 10 minutes), cm3 | 8 | 12 | 20 | 8 | 8 |
| Place | 3 | 4 | 5 | 1–2 | 1–2 |
Causes of malfunction
- Fuses under the dashboard on the ECU. The top one is 15 A (pump) and the bottom one is 7.5 A (goes to the ECU, to the ignition module).
- Faulty fuel pump relay. It is located there under the torpedo - the very top (below the top fuse).
- Poor fuel module mass. It is mounted under the dashboard, where the handbrake is. The mass needs to be cleaned and re-secured. If it disappears, the fuel level indicator will also not work.
- Lack of positive contact. Removing the back seat. We check the presence of contacts in the wire block. If there is no positive, then the reason is either the relay or the fuse.
- Fuel pump motor not working.
Device
In the VAZ-2115, the fuel supply system contains the following components:
- ramp;
- fuel line;
- filter;
- Control block;
- fuel injectors.
The fuel module itself includes:
- gasoline level sensor;
- gasoline pump;
- float;
- primary filter.
The latter's mesh is located directly at the suction port of the pump. It quite well rids the fuel of contaminants, the presence of which significantly reduces the service life of the entire system as a whole.
In addition, the gas line also has a filter that provides fine cleaning of the fuel.
Why the VAZ-2115 fuel pump does not work and what to do
Many call the heart of the car its power plant. However, it would be most correct to consider the fuel pump as such. Its functions, which are quite easy to verify, are very similar to those performed by the heart in the human body.
In this material we will talk about how to determine that it is the fuel pump on the VAZ-2115 that is not working, and we will tell you about ways to eliminate the detected problems. In reality, the failure of this unit has very characteristic signs that make it easy to distinguish it from other malfunctions that occur with the machine during its operation.
Most often, the car engine suddenly stalls while driving. Moreover, if you start the power plant again, very specific sounds are heard from under the hood, but the starter spins as if nothing had happened. Repeated attempts to move also end in failure.
Also, sometimes the car stops starting the first time. This problem usually occurs if it has been in neutral for some time.
The most typical symptoms of fuel pump failure are:
- the power unit of the car does not want to start;
- too low pressure level in the fuel system;
- engine tripping;
- loud “growling” of the engine at low speeds.
However, the first can happen for other reasons:
- problems with candles;
- ECU error;
- Some sensor is faulty.
An 8-valve engine tripping is a fairly typical sign of a fuel pump failure. In this case, the car drives jerkily, because the fuel flows improperly, which leads to poor performance of the cylinders.
The loud “roar” of the engine in the vast majority of cases indicates a failure of the fuel pump. Much less often, this indicates that the filters are clogged.
Why else might the pump motor not start? Here are the most common reasons:
- fuse blown;
- relay failure;
- mass break;
- failure of the electric motor installed in the pump;
- contamination of power terminals.
Differences from its predecessor
Among the most noticeable modifications are visible parts of the body (see also wiring diagram for VAZ 21099 injector).
In particular, the designers changed:
- the shape of the front wings;
- the shape of the headlights and side lights;
- back panel shape;
- hood and trunk lid.
As a result, the overall dimensions of the car also changed, but it remained the same front-wheel drive, four-door, five-seater sedan car.
Advice: video materials from thematic forums where VAZ 2115 owners share their impressions of year-round operation of the car can serve as a good help in evaluating a car.
Pressure
First of all, you will need to measure the pressure in the fuel supply system. If the pump works as it should, it is about seven atmospheres. To check, the pressure gauge is connected to the ramp through the fitting there. Remove the cap from it and screw on the measuring device.
If everything is in order, then the readings will be as follows:
- 2.5 kPa (idle);
- 3 (ignition on);
- 7 (if you pinch the fuel outflow hose);
- 2.5-3 (increase in speed).
In the same situation, if after the ignition is triggered the pressure gauge does not show anything, then most likely the pressure regulator has failed.
When no changes occur even after gaining speed, then the issue here is clearly in the fuel pump. A slow change in readings indicates a clogged filter mesh.
Checking the serviceability of the fuel pump on the injector
When, when you turn the ignition key, you hear a slight buzzing, a slight hum, this is how the fuel pump works, pumping gasoline creates pressure in the system. If, when you try to start, there are no such signs of the fuel pump working, then you can assume a malfunction of the electrics, the pump itself or its individual parts. Therefore, let’s look at how you can check the operation of a gas pump using a step-by-step logical chain. Starting from whether power is supplied to the fuel pump and ending with whether the fuel pump pumps at all, and if so, what pressure is created in the fuel rail.
Step 1: Checking the fuse
Checking the fuel pump fuse involves inspecting the integrity of the conductive plate and, if broken, replacing it. But if there is no new fuse, then wind one strand of copper wire around the fuse contacts. If it burns out again, it means the problem may be in the wiring.
Stage 2: Checking the relay
To check the fuel pump relay, remove it from the socket and connect a 12 volt light bulb according to the diagram. If the light bulb works, the relay itself is also working properly. An alternative is to use a multimeter in ohmmeter mode to measure the resistance of the relay coil winding. One probe is connected to terminal 85, and the other to 86. The device will show a break if the relay has failed.
Wiring
If the fuel pump fails, first of all, you need to make sure that the circuit was installed correctly. Three wires lead to its electric drive:
- one - to the fuel sensor;
- two - to the contacts of the motor itself.
A regular 12 volt light bulb will help you figure this out. It is connected to the power wires. When you turn on the ignition, it will light up - this means that the electrics are supplied correctly.
The lamp also checks the performance of the motor itself. In this case, it is connected to the protruding terminals of the drive, and its short-term flashing will indicate in this case a malfunction of this element.
Checking the fuel pump of a carburetor car (mechanical)
Mechanical fuel pump - diagram
To check the operation of the fuel pump, you should:
Delayed jet output is not a sign of a breakdown, especially if the car has been parked for a long time. As a rule, diaphragms eight and nine are the main cause of malfunction.
Be that as it may, you need to inspect both the strainer and the inlet/outlet valve.
Even if the gaskets are replaced, fuel may leak. In this case, the problem lies in the tightness of the fuel pump housing due to deformation during repairs.
Let's summarize:
The causes of fuel pump problems, both electrical and mechanical, are varied, and the need to find/fix a breakdown may take you by surprise along the way. By following the above recommendations, you will be able to independently carry out the entire necessary set of measures to diagnose this device. And you should start with the power supply (if it is an electric fuel pump) and the operation of the diaphragm when checking a mechanical fuel pump. Very often, the unstable operation of a fuel pump is not due to its breakdown, but to related parts - a filter, check valve or injectors.
Source
Weight
The fuel pump mass is located under the steering wheel, not far from the handbrake handle. It is its use that most often leads to wire breakage. In this case you will need:
- remove the cover;
- clean the ground contacts;
- attach it to its original place.
There is also a relay that controls the operation of the fuel pump. It is necessary so that when the ignition is turned on, operating pressure is immediately formed in the fuel supply system. It is important not to get confused, because there are three relays, and only one of them is related to the pump.
This element cannot be repaired and is simply replaced with a working one.
Diagnostics
A malfunction of the VAZ 2114/2115 fuel pump can be caused by:
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:
Checking the electrical circuit is carried out in the following order:
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.
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:
In addition, the presence of an assistant is desirable.
The verification procedure is as follows:
Replacing the fuel pump
If all the above elements function as they should, then all that remains is to clean the filters or install a working pump.
Before you begin this procedure, you will need to pump out the fuel in the tank. To replace the pump you will also need a screwdriver and a set of wrenches.
The procedure is performed in the following sequence:
- the car is de-energized by disconnecting the negative wire from the battery;
- the back seat will be removed;
- the protective plastic cover located under them is dismantled;
- All wires are disconnected from the pump;
- disconnect the fuel hoses;
- unscrew the fixing plate with a 7 key;
- pull out the pump itself.
It should be remembered that it is necessary to remove it from the gas tank very carefully, since in the process it is easy to damage the fuel sensor (float).
Posts 8
1 Topic by ggenn 2014-09-09 17:54:53 (2014-09-09 18:01:18 edited by ggenn)
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Topic: Resolved: Does anyone know the pinout of the fuel pump connector?
Does anyone know the pinout for the fuel pump connector? I can't find it on the net. I read that you need to supply power from the battery to check. Where to apply?
2 Reply from Admin 2014-09-09 18:44:00
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Re: Resolved: Does anyone know the pinout of the fuel pump connector?
judging by the latest diagram https://xn--2111-43da1a8c.xn--p1ai/sprav ... -2110.html two wires come to the fuel pump chip - black - minus, and the other (apparently gray) - positive. You can check it with a test lamp as a last resort. Connect the light bulb with one end to the block, the other to ground, where the plus light is on.
3 Reply from Patroclus 2014-09-09 19:31:50
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Re: Resolved: Does anyone know the pinout of the fuel pump connector?
Apply for gray plus, but what's the problem?
4 Reply from iliaBkmz 2014-09-09 20:44:56
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Re: Resolved: Does anyone know the pinout of the fuel pump connector?
Stop! – on the 10, the pump chip has not 2, but four contacts –
Accordingly, two for the pump, two for the FLS. Using the diagram, you can easily determine which one is responsible for what (the color may differ on different HVs, as well as the connection method (directly to the pump from the wiring harness or through an adapter harness, as in the photo above)
5 Reply from Patroclus 2014-09-09 22:33:46
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Re: Resolved: Does anyone know the pinout of the fuel pump connector?
so the conversation is about two wires, the gray one was always +. And the pink and blue ones went to the fuel sensor
6 Reply from iliaBkmz 2014-09-09 22:35:53
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Re: Resolved: Does anyone know the pinout of the fuel pump connector?
so we're talking about two wires
I think if the author knew which wires were in which connector, the question would not have arisen
7 Reply from Patroclus 2014-09-10 13:13:24
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Re: Resolved: Does anyone know the pinout of the fuel pump connector?
judging by the latest diagram https://xn--2111-43da1a8c.xn--p1ai/sprav ... -2110.html two wires come to the fuel pump chip - black - minus, and the other (apparently gray) - positive. You can check it with a test lamp as a last resort. Connect the light bulb with one end to the block, the other to ground, where the plus light is on.
If no one has read here, then we can talk for a long time
8 Reply from ggenn 2014-09-10 21:57:02 (2014-09-10 22:00:41 edited by ggenn)
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