Transfer Pump Fuel Volume Check

Turn ignition off. To check transfer pump (in tank), remove rear seat. Remove fuel sending unit access cover. Disconnect ignition coil secondary wire and jumper to ground.
With transmission in Neutral, crank engine for 3-4 seconds. While starter is turning and for a few seconds afterwards, an audible sound should be heard at the pump. If sound is not heard, go to next step. If sound is heard, go to step 5).
Remove fuel pump relay from relay panel. Activate fuel pump using Remote Control (VAG 1348/3A). If pump does not operate, disconnect fuel pump wire harness connector. See Fig 1 .
Using test light, check voltage between Brown wire and Red/Yellow wire. If voltage is present, replace fuel pump. If voltage is not present, repair open or short circuit in wiring.
Remove fuel pump relay. Disconnect and plug transfer pump output hose. Attach a hose to pump outlet connector and place other end of hose in a graduated container. Activate fuel pump for 10 seconds.
Minimum fuel flow should be 10 ounces (.3 liter). If fuel flow is low, check fuel tank filter for restriction. If fuel tank filter is okay, replace fuel pump.

Fig 1: Checking Transfer Pump Fuel Volume (Typical)

Courtesy of AUDI OF AMERICA, INC.

NOTE: Before testing main fuel pump, check transfer pump. See TRANSFER PUMP FUEL VOLUME CHECK.