/3A) using adapter lead (VW 1348/3-2) and adapter cables from (VW 1594) between fuse No. 17, terminal No. 2, and battery positive (+) terminal. On vehicles with A/C, connect clip to remote starter aid connection in engine compartment. Connect pressure gauge (VAG 1318) between fuel supply and fuel collector pipes with adapter (VAG 1318/1 1), (VAG 1318/13) and (VAG 1318/15). See Fig 1. Lever to pressure gauge in "OPEN"position. Fig 1: Identifying Fuel Gauge Installation For Fuel Pump Check Valve Test [IMAGE: http://127.0.0.1:8080/images25/G00177387/] Courtesy of AUDI OF AMERICA, INC. Operate remote control for approximately 30 seconds. Move lever on pressure gauge to "CLOSED" position. NOTE: Pressure gauge lever must remain in "CLOSED" position during measuring procedure. Briefly operate remote control until maximum 80 psi (5.6 kg/cm 2 ) is indicated. Watch pressure drop. After 10 minutes, maximum pressure drop should be 7 psi (0.5 kg/cm 2 ). If pressure drop is greater, carry out following checks: Check pressure gauge connections for leaks Check fuel lines for leaks If no leaks are present, fuel pump check valve is malfunctioning. Replace fuel pump.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Fuel Pump Check Valve

Use the Manual With the Right Hardware

When to See a Mechanic