Fuel Pressure Regulator And Holding Pressure: Notes

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.

NOTE:

The fuel pressure regulator regulates the fuel pressure to approximately 4 bar.

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

Follow all safety precautions. Refer to SAFETY PRECAUTIONS .

Follow the guidelines for clean working conditions. Refer to CLEAN WORKING CONDITIONS .

WARNING:

The fuel supply line is under pressure. Always wear protective eyewear and protective clothing to prevent injuries and fuel from coming in contact with your skin. Before loosening the fuel lines, place a cloth around the connection point. Remove the hose connection carefully to release the pressure.

-- Disconnect the fuel supply line -3-. Press the clip upward into the housing to release the line -3-.

Fig 1: Disconnecting Vacuum Line (Engines BGP And BGQ ONLY), Vent Line And Fuel Supply Line

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the pressure tester VAS 6550 to the fuel supply line using the hoses VAS 6550/1 and VAS 6550/2.

Fig 2: 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.

-- Make sure the drain is closed and the shut off levers are open.

-- Start the engine and run at idle speed.

NOTE:

If the engine does not start, activate the fuel pump with the output diagnostic test mode.

-- Check the fuel pressure on the pressure tester.

Specified value: 3.7 to 4.2 bar

If the fuel pressure is OK, check the residual pressure. Refer to FUEL PRESSURE REGULATOR AND HOLDING PRESSURE => If the specification is not reached, check the residual pressure as follows: .

If the specification is exceeded:

-- Check the fuel return line between the fuel filter and the flange for possible restrictions or blockages.

If no malfunction can be found:

-- The fuel pressure regulator is faulty. Replace it.

If the specification is not obtained:

-- Check the fuel lines for possible restrictions (kinks) or blockages.

If no malfunction can be found:

-- Replace the fuel pressure regulator.

NOTE:

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

-- Repeat the test.

If the specification is again not obtained:

-- Replace the fuel delivery unit, the fuel pump is faulty. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR .