S4 Quattro Wagon V8-4.2L (BHF) (2008)
![background image](/audi/s4_quattro_wagon/v8-4.2l_(bhf)/Page-893002.png)
Specification: approx. 3.5 bar
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Switch ignition off.
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Test for leaks and holding pressure by watching pressure drop on gauge.
‹› After 10 minutes the remaining pressure should be at least 2.5 bar.
If holding pressure drops below 2.5 bar:
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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. Refer to
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Remove locking flange cover and screws - arrows -.