One of the most important elements is the electric fuel pump, which is located in the car's fuel tank. The fuel pump pumped fuel to the system from, creating a certain pressure.
Car repair professionals allocate the following common problems of the fuel system that are associated with the fuel pump:
- basic pumps badly and does not create the right pressure;
- baszonasos does not pump when the ignition is turned on;
Taking into account the fact that the fuel pump is an electromechanical device, the most popular faults of the fuel pump are associated with both mechanical and electrical parts. Next, we will look at what signs indicate the breakdown of the fuel pump and why it ceases to swing the fuel pump partially or completely.
Signs of focus of fuel pumps
The main symptoms of the failure of the fuel pump, as well as failures in its work are:
- the car starts with difficulty, the engine works unstable, there are failures, jerks when pressed on the gas pedal, etc.;
- the pump does not pump after turning on the ignition, and does not pump the fuel pump, the engine does not start;
There are also cases when the fuel pump ceases to swing right in motion. The engine in a similar situation begins to work with failures and stalls immediately after the remains of gasoline in the fuel line are spent. The problem may occur both regularly and periodically.
Not shakes fuel pump: causes and diagnostics
Let's start with the fact that if the benzobak is filled, charged, dry and there is a spark, the starter turns the engine normally, but it does not occur, then does not occur at the same time, then pay attention to the fuel pump. A frequent problem is that there is no power on the fuel pump after the ignition is turned on. A similar fault is also manifested in motion when the power supply to the fuel pump and the motor suddenly stalls.
No less important point is how much gas station shakes. In other words, the pump can buzz and buzz (food is served), but do not create the desired pressure in the fuel line. The pressure in the fuel system with the working fuel pump must be more than 3 bar (which depends on the specific car model). The specified pressure is accumulated in the fuel ramp and has an indicator from 300 kPa and higher.
To check, it is necessary to measure the pressure gauge pressure in the fuel rail, taking into account the indicators that are the norm for a particular car model. Using the example of injection vases, the pressure at the inclusion of ignition 3 of the atmosphere, at idle the index is 2.5 atmospheres, while pressing 2.5- 3 atmospheric gas. This method will help accurately determine:
- fault of the fuel pressure regulator in the ramp;
- breakdown of a gas station or a noticeable reduction in its performance due to wear;
- strong filter contamination (fuel filter and / or gas station mesh);
In the second case, when pressed for gas, the pressure does not grow, in the latter case, the pressure gauge arrow rises, but very slowly or jerks.
Reducing the pressure indicator below the norm will lead to the fact that the motor may not start or start hard, told, twitch, work unstable and with failures. If this happens through the wine of the pump, and not the fuel filter, then the likelihood that the mesh of coarse purification of the fuel pump was hampered. In this case, there is no need, as it will be enough to replace or even clean the mesh.
If there is a suspicion that there is no voltage on the fuel pump, there is a way to quickly check. It is enough to turn the ignition key and listen, because at the moment of turning the key must be heard the light hum of fuel pump. If this buzz does not hear, it means that there is no power to the fuel pump, there are problems with wiring, etc.
We add that this method of determining the operation of the pump for 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 is included immediately after opening the driver's door, and not during the turn of the key in the lock. In this case, it may seem that the gas station does not work when the ignition is turned on, while
The sound of the pump work is simply not to hear.
Also in the overall list of possible reasons why the fuel pump does not have:
- failure of the fuse of the gas station;
- breakdown of the gas station relay;
- problems with the "mass" of the benzonasos;
- malfunction of the electric motor of the fuel pump;
- oxidation or contact hall and gas station terminals;
- focused fuel pump itself;
Wiring to gas station
Most cars, the wiring on the fuel pump is three wires: "plus", "minus", as well as the wire for reading the amount of fuel in the gas tank. If the fuel pump does not pump, then the cause may be no power.
To check power on the fuel pump, it is enough to take a 12 volt light bulb, feeding me up with an external fuel pump connector. After the ignition turn, the test lamp should light up. If this does not happen, it means that the problem is in external circuits. Lamps lighting will indicate the need to check the internal contacts of the fuel pump.
To test the external wiring, it is necessary to connect positive and negative contacts, which are removed from the fuel pump power connector, to the mass of the pump. Contacts You also need to connect to the gas station relay. If you place the negative contact for the mass, after which the ignition is turned on and the light lights up, then this means that this contact is faulty. In the event that the lighting of the bulb did not happen, then the problems with the "plus" are obvious. If you place contact on the relay and the light bulb lights up, there was probably damage to the wire on the segment that connects the relay and the fuel pump itself.
Electric motor Benzonasosa
If the pressure test in the fuel rail and external wiring on the fuel pump gives positive results, then the gas station motor should be checked. The specified electric motor is responsible for circulation of gasoline inside the fuel pump.
During the inspection, it should be borne in mind that the terminals on the fuel pumps themselves have an oxidic property, as a result of which the power is not supplied and the pump does not pump. In this case, the motor worker, but the terminals must be cleaned or turned.
To believe the gas station motor, you will need to fix the wireless lamp wires on the cleaned and good terminal of the electric motor, after which the ignition should be turned on. The lighting of the bulb will indicate that the gas station motor does not work.
Contact of the mass of the fuel pump
On problems with the mass of the gas station may indicate the fuel level sensor that works incorrectly. Mass can be poorly fixed, the fuel pump in this case does not pump fuel. The mass wire is usually under the dashboard and goes through the cabin. It is necessary to find the specified wire, check and clean all contacts, then securely secure the mass on the fuel pump.
The gas station relay is often attached next to the mass of the fuel pump, that is, under the dashboard. A normally working relay after turning on the ignition in a couple of seconds allows the pump to create pressure in the system and immediately turns off.
At the time of rotation of the ignition key, the driver hears the characteristic click (the relay turned on), then the similar click will indicate to shut down the gas station relay. If no such clicks are heard, it indicates a malfunction of the relay or its contacts. The optimal solution will replace the fuel pump relay to a new or obviously suitable device. We add that the cost of spare parts is quite affordable.
Fuse Benzonasosa
During diagnostics, it is necessary to check the fuse of the gas station. The specified fuse at 15 and is usually located in the fuse block in the boilerspace and has a Fuel Pump marking, which is translated and means the fuel pump.
The fuse of the fuel pump must be pulled out and inspect its contact. Contact integrity will say that the device is normal. Damaged contact will indicate that the fuse of the fuel pump burned. 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 reasons for fuels of fuel pump
Frequently, a non-professional installation of additional electrical equipment or security anti-theft systems leads to the fact that the power supply to the fuel pump disappears due to the rebound contacts or other connection errors.
Also should not be excluded and the possibility that in the car alarm or security complex there was a failure, after which the power supply of the fuel pump occurs. In other words, .
Finally, add that the fuel pump in the gas tank is immersed in gasoline, which is actively cooled. The habit of riding with an empty tank can quickly remove the fuel pump electromotor, as its burning occurs.
