Checking the Fuel Delivery Rate in the Engine Compartment:

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

-- Remove the Fuel Pump Control Module -J538- -2- from the cover -1-.

Fig 1: Identifying Cover With Fuel Pump Control Module J538

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

Fig 2: Identifying Right Cover

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-- Pull on the connector -arrow- without pressing the release to make sure the connection is secure.

Fig 3: Fuel Pump Control Module Connector

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If the connector was not connected correctly, it could cause a fault.

-- Disconnect the connector -arrow-.

-- Check the contacts on the connector and on the fuel delivery unit for damage.

-- Attach the Vehicle Diagnostic Tester - Test Adapter - 5 Pin VAS 5565 to the connector and to the fuel delivery unit.

Fig 4: Connecting Remote Control VAG 1348/3A To Test Instrument Adapter/DSO (5-Pin) VAS 5565 And To Battery Plus (+)

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-- Connect the Injection Rate Comparison Meter Kit - Remote Cable VAG 1348/3A to the Vehicle Diagnostic Tester - Test Adapter - 5 Pin VAS 5565 and the battery positive terminal clamp in the engine compartment.

NOTE:

This work step allows the fuel pump to run when the engine is not running.

-- Fuel delivery rate of the fuel pump is dependent on battery voltage. Also connect the Multimeter to the wires -1 and 5- in the Vehicle Diagnostic Tester - Test Adapter - 5 Pin VAS 5565.

Fig 5: Connecting Multi-Meter To Wires -1 And 5- Of Adapter VAS 5565

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-- Remove the supply line -1-. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 6: Disconnecting Fuel Supply Line

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-- Wipe up any leaking fuel with a cloth.

-- Connect the Pressure Tester Kit - Hose 1 VAS 6550/1 to the connection -A- on the Pressure Tester Kit VAS 6550.

-- Connect the Pressure Regulator Valve VAS 6550/4 to the Pressure Tester Kit VAS 6550 connection -B-.

Fig 7: Connect Fuel Line From Fuel Tank Using Pressure Tester Kit VAS 6550

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-- Connect the Pressure Tester Kit - Hose 2 VAS 6550/2 to the fuel line from the fuel tank.

-- Hold the open end of the Pressure Regulator Valve VAS 6550/4 hose in a measuring container.

-- Pull on the connector couplings to make sure they are secure.

-- Make sure that the drain valve -C- on the Pressure Tester (Diesel) -1- is shut.

Fig 8: Identifying Shut-Off Valves A And B On Pressure Tester Kit

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-- The shut-off valves -A and B- on the Pressure Tester Kit -1- are opened.

-- Push the Injection Rate Comparison Meter Kit - Remote Cable VAG 1348/3A.

NOTE:

The Transfer Fuel Pump -G6- is activated!

-- Adjust the pressure to 4 bar (58 psi) with the adjustment wheel on the Pressure Regulating Valve -arrow-.

Fig 9: Pressure Setting Knob

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-- From this point on do not move the pressure setting knob.

-- Empty measuring container.

-- Press the remote control for 60 seconds while measuring the battery voltage.

-- Compare the delivered quantity of fuel with the specified value in the table.

Fig 10: Identifying Graph Of Voltage Versus Delivery Rate

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Example

During test, a voltage of 10.5 Volts is measured. This results in a minimum delivery quantity of approximately 1200 cm³ /60 s.

If Specification Is Not Obtained

Fig 11: Filler Cap

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-- Open the fuel filler door unit.

-- Clean the area around the fuel filler tube.

-- Remove the cap -arrow- for the fuel filler tube.

-- Check the fuel delivery rate again. Refer to FUEL DELIVERY RATE, CHECKING .

If Specified Value Is Achieved

-- Check the fuel tank ventilation. Refer to FUEL TANK, CHECKING VENTILATION .

If Specification Is Not Obtained

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

-- Check the fuel lines for leaks and damage.

If No Malfunction Can Be Found

Proceed as follows to check the fuel delivery rate to the fuel filter.

Checking the Fuel Delivery Rate to the Fuel Filter

Fig 12: Fuel Supply Line At Fuel Filter

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-- Disconnect the fuel supply line -arrow- from the fuel filter. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

-- Connect the Pressure Tester Kit - Hose 1 VAS 6550/1 to the connection -A- on the Pressure Tester Kit VAS 6550.

-- Connect the Pressure Regulator Valve VAS 6550/4 to the connection -B- on the Pressure Tester Kit VAS 6550.

Fig 13: Connecting Pressure Tester Kit - Hose 1 VAS 6550/1

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-- Connect the Pressure Tester kit VAS 6550 to the fuel supply line -2- with the Pressure Tester Kit - Hose 2 VAS 6550/2.

-- Hold the open end of the Pressure Regulator Valve VAS 6550/4 hose in a measuring container.

-- Make sure that the drain valve -C- on the Pressure Tester (Diesel) -1- is shut.

Fig 14: Identifying Shut-Off Valves A And B On Pressure Tester Kit

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-- The shut-off valves -A and B- on the Pressure Tester Kit -1- are opened.

-- Push the Injection Rate Comparison Meter Kit - Remote Cable VAG 1348/3A.

NOTE:

The Transfer Fuel Pump -G6- is activated!

-- Adjust the pressure to 4 bar (58 psi) with the adjustment wheel on the Pressure Regulating Valve -arrow-.

Fig 15: Pressure Setting Knob

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-- From this point on do not move the pressure setting knob.

-- Empty measuring container.

-- Press the remote control for 60 seconds while measuring the battery voltage.

If Specified Value Is Achieved

-- Check the fuel line to the engine for possible kinks or blockages.

-- Check the fuel line to the engine for leaks and damage.

If No Fault Was Detected

-- Replace the fuel filter. Refer to FUEL FILTER .

If 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

Fig 16: Fuel Lines At Flange

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-- Pull the fuel line -1- off the flange. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

-- Connect the Pressure Tester Kit - Hose 2 VAS 6550/2 to the connection -A- on the Pressure Tester Kit VAS 6550.

-- Connect the Pressure Regulator Valve VAS 6550/4 to the connection -B- on the Pressure Tester Kit VAS 6550.

Fig 17: Connect Pressure Tester Kit - Hose 1 VAS 6550/1

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-- Connect the Pressure Tester Kit VAS 6550 to the fuel delivery unit -1- with the Pressure Tester Kit - Hose 2 VAS 6550/2.

-- Hold the open end of the Pressure Regulator Valve VAS 6550/4 hose in a measuring container.

-- Make sure that the drain valve -C- on the Pressure Tester (Diesel) -1- is shut.

Fig 18: Identifying Shut-Off Valves A And B On Pressure Tester Kit

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-- The shut-off valves -A and B- on the Pressure Tester Kit -1- are opened.

-- Push the Injection Rate Comparison Meter Kit - Remote Cable VAG 1348/3A.

NOTE:

The Transfer Fuel Pump -G6- is activated!

-- Adjust the pressure to 4 bar (58 psi) with the adjustment wheel on the Pressure Regulating Valve -arrow-.

Fig 19: Pressure Setting Knob

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-- From this point on do not move the pressure setting knob.

-- Empty measuring container.

-- Press the remote control for 60 seconds while measuring the battery voltage.

If Specification Is Not Obtained

Fig 20: Identifying Delivery Unit Fuel Hoses

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-- Remove the fuel delivery unit. Refer to FUEL DELIVERY UNIT .

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

-- Remove the fuel delivery unit and check the filter screen for dirt.

-- Check the fuel lines for leaks and damage.

-- Check whether the hose connections -arrows- to the fuel delivery unit -1- are sealed.

If No Fault was Detected

-- Check the current draw of the fuel pump. Refer to CURRENT DRAW, CHECKING .

If No Error was Detected During the Current Draw Test

-- Replace the fuel delivery unit. Refer to FUEL DELIVERY UNIT .

If the fuel delivery rate was reach, even though a fault in the fuel supply is still suspected (for example, intermittent loss of fuel supply):

-- Check the current draw of the fuel pump. Refer to CURRENT DRAW, CHECKING .

Tightening Specifications

Refer to OVERVIEW - FUEL DELIVERY UNIT/FUEL LEVEL SENSOR