Due to the fact that special tools are required when checking and, above all, dismantling the fuel pump (wrench for union nuts, etc.), these works must be carried out in the workshop. If you suspect a malfunction of the fuel pump, then the search for defects should be limited to the actions that are described below. Please note that the pump delivers fuel poorly, or does not deliver it at all, also if the fuel filter is clogged or the relay in the central switchgear has failed.
1. Check the fuel pump fuse first (nest 28) in the fuse box on the left side of the instrument panel.
2. If you have acute hearing, then you can hear the noise of the pump. You need to listen in the back of the car at the level of the fuel tank, the assistant should turn on the ignition at this time.
3. If you hear the noise of the pump, then, obviously, the pump is normal. If no noise is heard, check the fuel supply.
4. To do this, remove the supply or return pipeline of the petrol injection system. Attention, pipelines may be under pressure. Lower the pipeline into a suitable container.
5. Some fuel should come out of the pipeline even when the engine is not running, as there is residual pressure in the system.
6. If gasoline does not flow out, have an assistant actuate the starter. After that, the pump should supply fuel.
7. If gasoline does not come out, check the power to the pump on the blind flange of the fuel tank.
8. To do this, unscrew the cover of the blind flange under the lining of the trunk floor. First you need to fold the rear seat forward.
9. Disconnect the four-pin connector. To do this, it must be carefully unlocked with a screwdriver.
10. To measure voltage, connect a multimeter to the outer pins 1 and 4 of the connector. Have an assistant operate the starter. While the starter is running, the multimeter should show battery voltage.
To measure voltage, connect a multimeter to the external pins
11. If the nominal value is not reached, then this may be due to a malfunction of the corresponding relay, for this see chapter «Electrical equipment».
12. If the nominal value is reached, and the noise of the pump is not audible, carefully inspect the fuel pump. To do this, remove the fuel pump module (see description of relevant work steps).
13. Check up connection and integrity of wires between a flange and the fuel pump. If no defect is found, replace the fuel pump module.
Check the integrity of the wires between the flange and the fuel pump
Visitor comments