Test sequence

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2004 Audi A6, 2003 Audi S6, 2003 Audi A6, 2002 Audi S6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

Open cover of fuse box at left side of instrument cluster.
Remove fuse S228 at fuse carrier (position 28) (left row, 5th large fuse from top).
Connect V.A.G 1348/3A remote control connection using adapter cables from VAG1348/3-2 at right terminal of socket from fuse S228 (arrow).

Fig 1: Connecting Remote Control Connection Using Adapter Cables VAG1348/3-2 At Right Terminal Of Socket From Fuse 28

Courtesy of AUDI OF AMERICA, INC.

Connect alligator clip to vehicle battery B+.
Remove fuel filler cap from fuel filler tube.
Remove engine cover (arrows).

Fig 2: Removing Engine Cover
Courtesy of AUDI OF AMERICA, INC.

CAUTION: Fuel system is under pressure! Before opening system, place rags around the connection area. Then release pressure by carefully loosening connection.
Disconnect fuel return hose from line connection on fuel rail pipe.

Fig 3: Disconnecting Fuel Return Hose From Line Connection On Fuel Rail Pipe

Courtesy of AUDI OF AMERICA, INC.

Connect assisting hose -arrow- on distributor pipe and hold in a measuring container.
Operate remote control for 15 seconds (keep button pressed).
Compare fuel quantity pumped with specified value.

Fig 4: Comparing Fuel Quantity Pumped Versus Fuel Pump Voltage Graph
Courtesy of AUDI OF AMERICA, INC.

*) Minimum delivery rate cm³ /15 s

**) Voltage at fuel pump with engine off and pump running (approx. 2 volts less than battery voltage).
Install fuel return line with a new hose clamp.