If the specification is not reached, check the residual pressure as follows:

WARNING: This page is about a different car, the 2009 Volkswagen Rabbit, 2008 Volkswagen Rabbit, 2007 Volkswagen Rabbit, and 2006 Volkswagen Rabbit. However, it is still accessible from the selected car via links, so may be relevant.

-- Watch the pressure decrease on the pressure tester.

Fig 1: Connecting Pressure Tester VAS 6550 To Fuel Supply Line Using Adapters VAS 6550/1 And VAS 6550/2

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

After 10 minutes the pressure must not drop below a 3.0 bar decrease.

If the pressure drops further:

-- Start the engine and run at idle speed.

-- Turn the ignition off and close the pressure tester shut off lever -B- immediately.

Fig 2: Identifying Drain Valve -C- Is Closed And Shut Off Valves -A And B- Are Open

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

If the pressure no longer drops now:

Check for the leak on the engine side. Repeat the residual pressure check. Close the shut off lever -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:

The leak is on the fuel tank side.

-- Check the fuel lines for leaks.

If no malfunctions are found in the fuel lines:

-- Test the check valve of the fuel pump. Refer to FUEL PUMP CHECK VALVE, CHECKING .

If no malfunction is found here either:

-- Replace the fuel pressure regulator.

NOTE:

From 10.05, the fuel pressure regulator is integrated into the fuel filter and cannot be replaced.

-- Bleed the fuel system. Refer to FUEL SYSTEM, FILLING AND BLEEDING .