A8L Quattro Sedan W12-6.0L (BSB) (2005)
If pressure does not drop:
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Check pressure gauge for leaks.
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Check line connections and fuel injectors for proper seal.
If pressure drops again:
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Check pressure regulator in fuel filter:
‹› Check fuel pressure regulator.
Check Fuel Pressure Regulator
‹› Fuel pressure regulator is integrated in fuel filter
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Remove carpeting in luggage compartment.
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Unbolt cover for locking flange - arrows -.
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Disconnect fuel return line - 1 - (press release button).
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Position adapter piece - 2 -adapter (V.A.G 1318/26) on fuel return line - 1 -.