A8L Quattro Sedan V8-4.2L (AKB) (2002)
Fuel Pressure Check Valve: Testing and Inspection
WARNING!
Fire hazard. DO NOT smoke or work near heaters or have anything in the area that can ignite fuel!
Test requirements
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Fuel pressure regulator OK
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Fuel pump and fuel injectors OK
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No leaks in fuel lines
Checking
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Disconnect fuel supply line at fuel rail.
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Install pressure gauge VAG1318 with adapter between fuel supply line and fuel rail.
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Connect remote control VAG1348/3A, refer to "Fuel Pump, Checking" See: Fuel Pump/Testing and Inspection
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Press and hold remote control switch for approx. 30 seconds.
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Close valve on pressure gauge.
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Observe drop in pressure for 10 minutes.
Maximum pressure drop (after 10 minutes): 0.5 bar (7 psi)
If pressure drop is not OK:
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Check pressure gauge connectors for leaks.
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Check fuel lines for leaks.
If there are no leaks:
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Replace fuel pump and integrated reservoir.