Connect the Vehicle Diagnostic Tester And Perform Guided Functions "Check Electric Fuel Pump(S)"

Vehicles with engine code CJAA

-- Close the shut-off valve -B- for maximum 15 seconds.

The target value is minimum 0.5 bar:

Continuation for all vehicles

If the specification is not obtained:

-- Check the fuel lines inside the engine compartment for possible bends, blockages and damage.

-- Check the fuel lines inside the engine compartment for leaks.

If no faults are detected:

Check the fuel delivery quantity in front of the fuel filter as follows:

Check the fuel delivery quantity in front of the fuel filter:

-- Remove the fuel supply line -B-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 1: Identifying Fuel Line Couplers

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the Diesel Pressure Tester Kit - Hose 2 VAS 6551/2 between the supply line from the fuel tank and the connection -B- on the Diesel Pressure Tester Kit VAS 6551.

Fig 2: Identifying Diesel Pressure Tester Kit

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-- Connect the Diesel Pressure Tester Kit - Hose 1 VAS 6551/1 between the connection -A- on the Diesel Pressure Tester Kit VAS 6551 and the fuel line to the fuel filter.

-- Press the On/Off  button to switch on the Diesel Pressure Tester Kit VAS 6551.

-- Open the shut-off valves -A- and -B- on the Diesel Pressure Tester Kit VAS 6551 in the direction of flow.

Fig 3: VAS 6551

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Close cut-off tap -C-.

-- Connect the Vehicle Diagnostic Tester and repeat Guided Function "check electric fuel pump(s)".

If the specification is now obtained:

Check and fuel filter and replace it, if necessary. Refer to FUEL FILTER, REMOVING AND INSTALLING .

If the specification is not obtained:

Proceed as follows to check the fuel delivery rate at the fuel delivery unit:

Check the fuel delivery quantity at the fuel delivery unit:

-- Remove the rear bench seat. Refer to REMOVAL AND INSTALLATION .

-- Unclip the locking flange cover -1- at the tabs -arrows- using the Trim Removal Wedge 3409.

Fig 4: Identifying Right Cover

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-- Unlock and disconnect the fuel supply line -1- from the locking flange. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 5: Fuel Lines At Flange

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-- Connect the Diesel Pressure Tester Kit VAS 6551 between the fuel supply line and the fuel delivery unit using the Diesel Pressure Tester Kit - Hose 1 VAS 6551/1 and Pressure Tester Kit - Hose 2 VAS 6550/2.

Fig 6: Identifying Fuel Line And Fuel Delivery Unit

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• Connect the Diesel Pressure Tester Kit - Hose 1 VAS 6551/1 -2- between the Diesel Pressure Tester Kit VAS 6551 -1- and the fuel delivery unit -5-.
• Connect the Diesel Pressure Tester Kit - Hose 2 VAS 6551/2 -3- between the Diesel Pressure Tester Kit VAS 6551 -1- and the fuel delivery unit -4-.

-- Open the shut-off valve -A-.

Fig 7: VAS 6551

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Close the shut-off valves -B- and -C- on the Diesel Pressure Tester Kit VAS 6551.

-- Connect the Vehicle Diagnostic Tester and repeat Guided Function "check electric fuel pump(s)".

If specified value is achieved:

-- Check the fuel lines to the engine compartment for possible bends, blockages and damage.

-- Check fuel lines for leaks.

If the specification is not obtained:

-- Remove the fuel delivery unit. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .

-- Check the filter screen for dirt.

-- Make sure all the hoses are connected -arrows-.

Fig 8: Identifying Delivery Unit Fuel Hoses

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If no fault was detected:

-- Replace the fuel delivery unit. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .