Note: It is recommended that the fuel pump diagnostics be carried out at a specialized service station.
To diagnose the fuel pump:
- turn off the ignition;
- Disconnect the high pressure fuel line;
Warning: Even when the engine is not running, some gasoline leaks because the fuel system is under pressure.
- if gasoline does not flow out, turn on the ignition;
- if the fuel still does not flow out, check the pump relay fuse. If the fuse is defective, replace it. If the pump runs after this, find the cause of the fuse failure;
- if the pump is not working yet, check with a tester whether voltage is applied to the diodes. In the absence of a tester, contact the service station;
- if voltage is applied, then the pump is faulty or the cable is broken;
- if the pump runs and no fuel enters the distribution pipeline, then the fuel filter is clogged or any fuel line is damaged;
- if after all checks the pump does not work, remove it to check and replace if necessary. A special tool is required to remove the pump.
The electric fuel pump is energized through a relay in the engine compartment. The pump only works when the engine is running or when the ignition key is turned to the engine start position. The second relay is energized when the engine is not running with the ignition on. The relay interrupts the electrical current through the interlock circuit in the engine control unit. Thus, gasoline cannot flow out, for example after an accident.
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