A8 Quattro Sedan V8-4.2L (BGK) (2006)
After 10 minutes there must be a residual pressure of at least 2.5 bar.
The residual pressure drops below 2.5:
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Start engine and run at idle speed.
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Wait until pressure has risen, and then switch ignition off. Simultaneously close shut-off valve of fuel injection pressure gauge (VAG1318) (lever
perpendicular to direction of flow).
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Watch pressure drop on gauge.
The following malfunctions are possible if pressure does not drop:
‹› Pressure gauge leaks
‹› Fuel injectors or line connectors leak
If pressure drops again:
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Check fuel pressure regulator.
Fuel Pressure Regulator, Checking
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Remove luggage compartment floor liner.
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Remove right locking flange cover - arrows -.
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Remove fuel return line - 1 -. To do this, press release button.