A8 Quattro Sedan V8-4.2L (BGK) (2006)
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Watch pressure drop on gauge.
If pressure falls again, fuel pump return valve leaks.
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Replace fuel pump,
If pressure does not drop:
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Replace fuel filter with integrated fuel pressure regulator, refer to Repair Manual.
Assembly is reverse of removal, but note the following:
CAUTION!
Before removing pressure gauge, relieve fuel pressure through shut-off valve opening. Hold a container under the connection.
‹› Starting the engine can take up to 15 seconds the first time.
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Check fuel system for leaks => [ Fuel System, Checking for Leaks ].
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Check DTC Memory.
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Read out readiness code => [ Readiness Code, Reading ] See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes. If DTC memory was erased, readiness code must be generated => [ Readiness Code, Generating ] See: Computers
and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.
