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

-- Remove the bench seat. Refer to REAR SEATS .

-- Remove the carpet and fold it upward.

-- If equipped, remove the Fuel Pump Control Module -J538- -2- from the right cover.

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-- Unclip the right cover -1- at the tabs in direction of -arrows- using the :3409 .

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-- Remove the fuel line -2- on the fuel delivery unit flange -2-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, DISCONNECTING .

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CAUTION:

The fuel system is under pressure.

Risk of injury from fuel spraying out.

- Wear protective eyewear.

- Wear safety gloves.

- Reduce the pressure: place clean cloths around the connection point and carefully open the connection point.

-- Connect the :VAS6550 to the fuel delivery unit -1- with the :VAS6550/2 .

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-- Connect the :VAS6550/1 between the :VAS6550 and the fuel supply line -2-.

-- Pull on the connector couplings to check them for secure fit.

-- Make sure that the drain valve -C- on the :VAS6550 -1- is closed.

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-- The shut-off valves -A and B- on the :VAS6550 -1- are opened.

-- Repeat the output diagnostic test mode to build up the pressure again. Refer to FUEL PRESSURE, CHECKING .

If the Specified Value Is Obtained:

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

-- Check the fuel line for leaks and damage.

If the Specified Value Is Not Obtained:

-- Remove the fuel delivery unit and inspect it for debris. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .

-- Make sure all of the hoses are connected.

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

-- Check the fuel lines for leaks and damage.

If No Error Can Be Found:

NOTE:

The pressure relief valve and the fuel filter are integrated in the fuel delivery unit flange and cannot be replaced separately.

-- Check the fuel delivery unit fuel pressure again. Refer to FUEL PRESSURE, CHECKING .

If the Specified Value Is Not Obtained:

-- If the fuel pump is faulty, replace the fuel delivery unit. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .