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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
on the engine side.

-

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: Testing and Inspection.

If no malfunction is found here either:

-

Replace the fuel filter.

When removing the (VAS 6550) after completing the test:

-

Turn off the ignition.

-

Place a cloth around the connection to catch any leaking fuel.

Powertrain Management > Fuel Delivery and Air Induction > Fuel Pump > Fuel Pressure > System Information > System Diagnosis > Fuel Pump Electrical, Testing > Page 3249

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