S4 V8-4.2L (BHF) (2004)
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Start engine and run at idling speed.
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Switch off ignition once pressure has built up. At the same time, close cut-off valve of pressure gauge V.A.G 1318 (lever at right angle to direction
of flow).
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Observe pressure drop on gauge.
Pressure drops again:
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Check pressure gauge for tightness.
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Check line and O-rings at the fuel rail and injectors for tightness.
Pressure does not drop:
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Check pressure regulator in fuel filter
Vehicle with all-wheel drive:
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Remove rear seat
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Remove locking flange cover and screws (arrows).
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Remove fuel return line (arrow) from locking flange (left vehicle side).