Fuel, Checking Delivery Quantity

WARNING: This page is about a different car, the 2015 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools And Workshop Equipment Required

Diesel Pressure Tester Kit:VAS6551
Diesel Pressure Tester Kit - Adapter Set: VAS6551/5
Trim Removal Wedge:3409
Hose Clip Pliers:VAG1921
Pressure Regulator Valve:VAS6551/6
Vehicle Diagnostic Tester
Measuring Container, Minimum Capacity: 3 liters

WARNING:

Remember, the fuel pump will turn on when a door is opened, if the battery is connected. Fuel may leak out when the system is open.

Test Conditions

Connect the battery charger. The voltage must be minimum 12.5 V. Refer to BATTERY, DISCONNECTING AND CONNECTING .
Fuses OK. Refer to Wiring Diagram.
Fuel Pump Control Module -J538- is OK. Refer to Vehicle Diagnostic Tester.
The fuel filter is OK.
Fuel tank minimum ¹ /₂ full.
Make sure the vehicle is level.
All electrical consumers such as, for example, headlamps and rear window defogger, must be off.
Fuel pressure OK. Refer to FUEL PRESSURE, CHECKING .

NOTE:

The vehicle must be fueled with diesel fuel treated for the season. Summer diesel fuel can coagulate at low winter temperatures under some conditions.

Diesel fuel bought in the summer can be filtered to 0 °C (32 °F).

Diesel fuel sold during the transition time can be filtered to -10 °C (14 °F).

Diesel fuel bought in the winter can be filtered to -20 °C (-4 °F).

Test a sample in the winter if there is doubt. The sample should set outside at low outside air temperature for approximately 1 hour. If the fuel coagulates at temperatures down to -20 °C (-4 °F), then this diesel fuel is not suited for low temperatures. This coagulation can plug the screen in the fuel delivery unit as well as in the fuel filter.

-- Follow all safety precautions. Refer to SAFETY PRECAUTIONS .

-- Follow the guidelines for clean working conditions. Refer to PARKING/AUXILIARY HEATER AND FUEL SYSTEM CLEAN WORKING CONDITIONS .

-- Turn off the ignition.

-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .

-- Move the right front seat all the way forward.

-- Remove the rear bench seat. Refer to BENCH SEAT/SINGLE SEAT, REMOVING AND INSTALLING .

-- Open the clamp -arrow- on the fuel supply line -1-.

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WARNING:

Fuel Lines Are Under Pressure.

Danger of personal injury to eyes and skin.

Wear protective eyewear and protective clothing in order to avoid injury and contact with the skin. Wrap a cloth around the connection before loosening hose connections. Open the connection carefully and release the pressure.

-- Remove the fuel supply line -1- from the high pressure pump -2-.

-- Insert the :VAS6551/5-1 into the fuel supply line and secure with a clamp.

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-- Connect the :VAS6551/2 between the :VAS6551/5-1 and the connection -A- on the :VAS6551 .

-- Connect the :VAS6551/6 to the connection -B- on the :VAS6551 .

-- Hold the open end of the :VAS6551/6 hose in a measuring container.

-- Press the On/Off button to switch on the :VAS6551 .

-- Make sure that the drain valve -C- on the :VAS6551 -1- is closed.

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-- The shut-off valves -A and B- are opened on the :VAS6551 -1-.

-- Connect the Vehicle Diagnostic Tester.

-- Select Guided Function 01 Activate Fuel Pump .

-- Select Check Fuel Pump Delivery Pressure/Delivery .

-- Follow the instructions given by the Vehicle Diagnostic Tester.

-- Set the pressure to 4.5 bar (65 psi) using the :VAS6551/6 .

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-- The initial pressure is set by turning the adjusting wheel -arrow- on the :VAS6551/6 .

Specified value: 4.5 bar (65 psi) pressure.

-- Do not move the adjusting wheel -arrow- any more.

-- Empty measuring container.

-- Repeat Check Fuel Pump Delivery Pressure/Delivery .

NOTE:

The Transfer Fuel Pump -G6- is now activated for 30 seconds.

-- Check the amount of fuel in the measuring container.

Specified Value: Minimum delivery rate 1, 100 cm³ /30 s.

If The Minimum Delivery Rate Is Not Attained:

-- 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 Malfunction Can Be Found:

Check The Fuel Delivery Quantity In Front Of The Fuel Filter As Follows:

Check The Fuel Delivery Quantity In Front Of The Fuel Filter

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

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

WARNING:

Fuel Lines Are Under Pressure.

Danger of personal injury to eyes and skin.

-- Connect the :VAS6551/2 to the fuel supply line coming from the fuel tank.

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-- Connect the :VAS6551/2 to the connection -A- on the :VAS6551 .

-- Connect the :VAS6551/6 to the connection -B- on the :VAS6551 .

-- Hold the open end of the :VAS6551/6 hose in a measuring container.

-- Press the On/Off button to switch on the :VAS6551 .

-- Make sure that the drain valve -C- on the :VAS6551 -1- is closed.

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-- The shut-off valves -A and B- are opened on the :VAS6551 -1-.

-- Repeat Check Fuel Pump Delivery Pressure/Delivery . Refer to FUEL, CHECKING DELIVERY QUANTITY .

If The Minimum Delivery Rate Is Now Obtained:

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

If Specified Value Is Again 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 BENCH SEAT/SINGLE SEAT, REMOVING AND INSTALLING .

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

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-- Unclip the grommet -1- downward out of the cover -2-.

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-- Guide the cover -2- on the wiring harness -3- downward.

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