Fuel Pump, Testing (General, Engine)

WARNING!
Fire hazard! DO NOT smoke or work near heaters or have anything in area that can ignite fuel!


Checking power supply
- Battery fully charged
- Fuse 28 OK
- Test voltage supply to fuse 28
- Fuel supply OK

- Switch ignition on.

- Fuel pump must be heard to run briefly. (Second person will be required for this if surrounding noise level is too high).

If fuel pump does NOT run:
- Remove cover for fuel pump module (under luggage compartment trim, right rear).
- Disconnect harness connector for fuel pump and fuel level sensor.
- Supply voltage to fuel pump using VAG 1551 scan tool and "Output Diagnostic Test Mode" function 03.







- Connect multimeter between connector terminal 1 (green wire) and terminal 4 (brown wire) using adapter cables from VW 1594 connector test kit.
- Specified value: approx. battery positive voltage (B+)
- If specified value is obtained, reconnect harness connector.







- Using ohmmeter, check for continuity between connector (outside of housing), harness connector and fuel pump.

If wiring is OK:
- Replace fuel pump. Refer to "With Front Wheel Drive", Locations
- Install cover for fuel pump module.

Checking fuel delivery
- Fuse 28 OK
- Relay in relay position 6 OK
- Fuel filter OK
- Battery fully charged







- Disconnect fuel return line -1- at engine compartment bulkhead and hold in measuring container.
- Connect remote control VAG 1348/3A with auxiliary cable VAG 1348/2 to fuse 28, connect positive (+) cable to battery.
- Operate remote control for 15 seconds (hold down button).







Fuel pump check valve, checking
Testing check valve.