Bleeding fuel system after installing high-pressure pump — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

Don't miss

• Connect fault reader and select engine electronics control unit 1 with "“address word”" 01. When doing this, the ignition must be switched on.

🔧 Engine codes this applies to

📋 Procedure

1. Disconnect return pipe at fuel filter. Attach transparent hose to the T-piece and route this hose into a beaker.
2. Connect fault reader and select engine electronics control unit 1 with "“address word”" 01. When doing this, the ignition must be switched on.
3. Select "“Final control diagnosis”" function.
4. Perform final control diagnosis as far as control element fuel pump relay J17 (for filling baffle housing in tank).
5. Leave this control element activated for approx. 30 seconds (to fill baffle housing in tank).

6. Check fuel pump actuation. Fuel supply system - diesel engines; Rep. Gr. 20; Fuel supply system
7. Check actuation of electric fuel pump 2 Fuel supply system - diesel engines; Rep. Gr. 20; Electrical checking of fuel pump.
8. Leave this control element activated for approx. 30 seconds.
9. If fuel does not yet emerge, repeat actuation of both control elements.
10. Re-connect return pipe to T-piece.
11. Connect all sensors and actuators before starting engine.
12. Start engine (starting operation: max. 60 seconds).
13. Run engine at moderate speed for several minutes and then switch off.
14. Check fuel system for leaks.
15. Then perform a test drive, accelerating at least once to full load before checking the high-pressure section again for leaks.
16. Interrogate fault memory.

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