Fuel Pump, Checking

FUEL PUMP, CHECKING

Special tools, testers and auxiliary items
- Remote control VAG 1348/3A with VAG 1348/3-2 adapter cable
- Voltage tester VAG 1527B
- Connector test kit VW 1594
- Ring nut spanner 3217
- Pressure tester VAG 1318
- Adapter 1318/1
- Adapter 1318/10
- Adapter 1318/11
- Measuring container

Test conditions
- Battery voltage OK.
- Fuse No.18 OK.

Test sequence
- Switch ignition on.
- Fuel pump must be heard to run briefly

If the fuel pump does not run:
- Switch ignition off.





- Remove fuel pump relay J17 from relay panel, position -12-.

CAUTION!
- If tools are needed to remove relays or control units from relay panel, first disconnect battery Ground (GND) strap.
- Before disconnecting battery, ALWAYS ask for radio code (if equipped with an anti-theft radio).

- Connect VAG 1348/3A remote control with VAG 1348/3-2 adapter cable to terminal 4 and battery positive (B+).
- Operate remote control.

If fuel pump runs:
- Check activation of fuel pump relay.

If OK:
- Replace fuel pump relay J17.

If fuel pump does not run:
- Remove luggage compartment floor covering.
- Disconnect harness connector from fuel tank flange.





- Connect VAG 1527B voltage tester to the outer terminals of the connector using adapter cables from VW 1594 test kit.
- Operate remote control.
- LED must light up

If LED does not light up:
- Check for open circuit using wiring diagram.

If LED lights up (voltage supply OK.):
- Unscrew ring nut with 3217.
- Check whether electrical wires between flange and fuel pump are connected.

If no open circuit can be found:
- Replace fuel pump.