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How to Bleed the Fuel Pump on an Audi A4

Model: Audi A4 B7 - Years 2004-2008
Part: Fuel pump

If you disconnect and reconnect the high-pressure pump, for example, for servicing, it is absolutely essential that at the end of the installation, and before starting the engine, the pump is filled with gasoline and all the air inside has been evacuated. This is necessary to allow the engine to start and to ensure proper lubrication of the pump itself. Proceed by filling the pump with gasoline using a syringe, injecting it from both the inlet and return sides. At this point, connect a vacuum pump to the return line of the fuel filter and pump until no more air bubbles appear in the system.

Updated on 20 February 2026 by ScegliAuto

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