A8L Quattro Sedan W12-6.0L (BSB) (2005)
If the pressure now does not drop:
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Check pressure gauge for leaks.
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Check line connections and fuel injectors for leaks.
If the pressure drops again:
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Check pressure regulator in fuel filter.
Fuel pressure regulator, checking
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Remove covering from luggage compartment floor.
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Remove screws - arrows - from fuel flange cover and remove cover.
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Disconnect fuel return line - 1 - (press coupling button to release).
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Attach adapter - 2 - to disconnected fuel return line.