With All Wheel Drive

Fuel Pump, Electrical Checking


Required special tools, testing equipment and auxiliary equipment

- VAG1348/3A Remote control using VAG1348/3-2 adaptor cable
- Fluke 83 multimeter (or equivalent)
- VW 1594A adaptor kit

Test requirements
- Battery Voltage: 12 Volts minimum







- Fuse 28 OK







- Relay 6 in Fuse / Relay panel OK
- Fuel filter OK
- Ignition switched OFF.

Test sequence
- Open fuse box cover on left side of instrument panel.
- Remove fuse 28 from fuse panel
- Left row, 5th fuse from top







- Connect remote control VAG1348/3A on right side of fuse socket 28 using VAG1348/3-2 adaptor wire -arrow-.
- Connect clamp to Battery +.
- Press remote control switch.
- Fuel pump when running must be audible.


NOTE: The fuel pump runs very quietly. Avoid ambient background noise as much as possible during fuel pump checks.


If pump running noise is not audible
- Remove connector flange cover under luggage compartment trim.







- Unlatch and disconnect 4-pin harness connector -1-.







- Switch Fluke 83 multimeter to 20 Volt range
- Connect multimeter between terminals 1 (green/yellow) and 4 (brown) of harness connector using jumper wires from VW 1594 adaptor kit.
- Press remote control switch continuously and read Voltage.
- Specification: approx. Battery Voltage.

If specified value obtained but no audible sound from pump
- Remove cover flange as follows


WARNING!
Fuel system is under pressure! Before opening, place clean cloths around the connections to be opened. Carefully loosen the connections to relieve pressure.







- Mark return line -2- and supply line -3- and remove from cover flange.







- Unscrew union nut using wrench 3217.
- Take cover flange and sealing ring out of the fuel tank opening.







- Check wiring between flange and fuel pump for continuity.

If wiring OK
- Fuel pump faulty, replace.
- Fuel supply unit, installing.