Volkswagen Workshop Manuals
Eos (1F7) V6-3.2L (BUB) (2008)
Powertrain Management > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Pump Electrical, Testing > Page 2700
If the pressure drops further:
Start the engine and run at idle speed.
Turn the ignition off and close the (VAS 6550) shut off valve - B - immediately.
If pressure no longer drops now:
Check for the leak on the engine side. Repeat the residual pressure check. Close the shut off valve - A - this time to determine if there actually is a leak
Check the fuel rail and fuel injectors for leaks.
If the pressure drops again:
(Leak on fuel tank side)
Check the fuel lines for leaks.
If no malfunctions are found in the fuel lines:
Test the check valve in the fuel pump. Refer to => [ Fuel Pump Check Valve, Checking ] See: Fuel Delivery and Air Induction/Fuel Pump/Testing
If no malfunction is found here either:
Replace the fuel filter.
When removing the (VAS 6550) after completing the test:
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