A4 Sedan V6-2.8L (AFC) (1996)
Residual pressure 10 minutes after stopping engine:
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With cold engine: 2.2 bar (32 psi) minimum
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With a hot engine: 3.0 bar (44 psi) minimum
NOTE: The pressure increase for a hot engine is caused by fuel expansion and is normal.
If residual pressure is too low:
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Check pressure tester connections for leaks.
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Check fuel lines for leaks.
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Check fuel pump check valve.
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Check fuel injectors for leaks, refer to "Fuel Injector Leak Testing and Delivery Quantity, Checking" See: Fuel Injector/Testing and Inspection
If there are no leaks and the fuel pump check valve is OK:
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Replace fuel pressure regulator and repeat residual pressure test.