Troubleshooting a Fuel Pump (Focus Turnier 1)

The electric fuel pump is supplied with voltage by a relay. Starting from the engine start-up phase, the pump supplies fresh fuel to the injectors. The second relay starts working when the engine is not running with the ignition on (the control unit no longer receives speed pulses). The relay then interrupts the current supply via a safety switch in the engine control unit. Thanks to this, for example, gasoline cannot leak out after an accident. Checking the fuel pump is a job for a workshop. When troubleshooting, it is better to limit yourself to the following points.

Turn off the ignition.

Loosen the fuel injection line at the distributor - have a rag handy to protect against any splattering gasoline.

Even when the engine is not running, some gasoline should come out, since the fuel system is under pressure.

If the connector remains dry, turn on the ignition briefly (do not operate the starter).

If the pump does not work, check the fuse or safety relay.

If the gasoline still doesn't flow, check the pump relay.

The fuel pump should now start working.

Otherwise, remove the cover under the rear seat and gently tap the pump body with a small hammer - sometimes this helps.





If possible, also check that the electrical connections of the pump are correctly secured.

If the pump still does not work, check the voltage with a diode voltage indicator (a regular test lamp would damage the control unit). Do not forget to turn on the ignition first.

If there is voltage, the pump is faulty, or there is no continuity in the connected wire, your own chances of repairing faulty pumps are slim, so it is better to install a new pump.

If the pump is running but there is no fuel in the discharge line, then the fuel filter or fuel line is clogged or maybe just kinked.