FWD

Fuel Pump, Testing (Electrical Test)

Special tools and equipment







- VAG 1348/3A with VAG 1348/3-2
- VAG 1526 A
- VAG 1594 A

Requirements for test
- Battery voltage not less than 12.7 V
- Fuse in fuse holder -S228- OK (plug-in position No. 28)







- Fuel pump relay (arrow) OK (located at plug-in position No. 1 in nine-way relay carrier behind storage compartment on driver's side)
- Fuel filter OK
- Ignition switched off

Test sequence
- Open fuse box cover on the left side of the instrument panel.
- Pull Fuse in fuse holder -S228- off plug-in position 28 of fuse carrier (left row, 5th large fuse from the top).







- Connect remote control VAG 1348/3A with adapter cable VAG 1348/3- 2 to right-hand fuse socket terminal of Fuse in fuse holder -S228- (plug-in position No. 28).
- Connect clamp to vehicle battery (+).
- Press remote control switch.
- Pump should start running (audible when standing close to fuel tank).


NOTE: The fuel pump runs very quietly. Where possible, avoid noisy surroundings for this test.


If no running noise is audible:

Sedan:
- Detach trim in luggage compartment.
- Fold down rear right seat backrest if necessary.

Avant:
- Remove 1/3 backrest, left.
- Remove left side trim of luggage compartment and protective pan.

All vehicles:







- Detach cover for flange -arrows-.







- Disengage and remove electrical harness connector -1-.







- Connect multimeter (voltage range) between contacts 1 and 4 of connector.
- Press remote control switch.
- Specification: approx. battery voltage

If specification is not reached:
- Repair open circuit in wiring according to wiring diagram.

If the specification is obtained, even though the fuel pump did not run:
- Remove fuel delivery unit page







- Check that electrical wires between flange and fuel pump are connected and test for continuity.

If no fault is detected in the wires, fuel pump is malfunctioning. Replace fuel delivery unit.
- Installing fuel delivery unit.