It receives positive current through the fuel pump relay (chapter Electrical equipment). The interlock circuit ensures that the pump only turns on when the motor is running. The relay receives information that the engine is running from the control unit. The interlock circuit must not allow fire due to gasoline leakage as a result of an accident.
Here it is checked whether the fuel pump delivers gasoline. To do this, the recirculation hose (2) disconnected at the junction. Attach the hose to the fuel supply line (1) and drop it into the container.
Six-cylinder engine:
- 1 - recirculation pipeline;
- 2 - fuel supply line;
- 3 - fuel pressure regulator.
Troubleshooting an electrically driven fuel pump
Check the fuse first (chapter Electrical equipment). If it's ok:
1. Sometimes listening can tell if the pump is running: listen under the car at fuel tank height to see if the pump turns on briefly when your assistant turns on the ignition.
2. If you hear the sound of the pump, then it is probably in order. If you do not hear anything, then check if fuel is being supplied:
3. Remove the fuel supply or recirculation line and lower it into a container.
4. Even when the engine is not running, some fuel should come out, as there is a certain residual pressure in the fuel system.
5. If not, have your assistant actuate the starter.
6. The fuel pump should now be supplying fuel.
7. If this is not the case, then you need to check the multi-pin connector at the top of the blind flange of the fuel tank, whether current is supplied to the pump at all:
8. Fold up the floor covering of the trunk.
9. Unscrew the black cap.
10. Disconnect the multi-pin connector.
11. Using a voltmeter or test lamp, check if there is a voltage of about 12 V between connector pins 1 and 4 (brown and green/yellow wire). To take the measurement, your assistant must actuate the starter (shift lever in neutral position, handbrake applied).
12. If, despite the correct voltage, the pump does not work, it is faulty - dismantle and replace it.
13. If there is no voltage, the relay may be faulty. To check it, see the chapter Electrical equipment.
14. Among other sources of malfunctions, one should mention: a defect in the wire to the relay or to the pump, a clogged or kinked gas line, a clogged main filter.
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