Fuel Pressure, Checking

WARNING: This page is about a different car, the 2014 Volkswagen Touareg, 2013 Volkswagen Touareg, 2012 Volkswagen Touareg, and 2011 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.

-- Read the Safety Precautions before starting. Refer to SAFETY PRECAUTIONS .

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

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.

-- Disconnect the fuel supply hose -arrow- from the fuel supply line.

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-- Connect the :VAS6550 with the :VAS6550/2 , the : VAS6550/3-1 and the : VAS6550/3-2 as shown.

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NOTE:

Secure the hose lines with the included clamps.

Ensure proper seating of the hose clamps.

-- Open the shut-off valves "A" and "B" on the : VAS6550 in the direction of flow.

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-- Close the drain valve "C".

-- Press the On/Off button to turn the : VAS6550 on.

-- Connect the Vehicle Diagnostic Tester.

-- Switch the ignition on.

-- On the OBD screen, press one button after the other: 01 - engine electronics and output diagnostic test mode .

-- Push the arrow button → on the display to the fuel pump electronics output diagnostic test mode .

The fuel pump must now accelerate slowly up to the maximum RPM.

-- Read the pressure on the : VAS6550 .

Specified value: 5.0 to 7.0 bar (72.51 to 101.52 psi)

-- Turn off the ignition.

If Specified Value Is Achieved

-- Holding pressure, checking. Refer to RESIDUAL PRESSURE, CHECKING .

If Specification Is Not Obtained

NOTE:

If the :VAS6550 is to be removed, open shut-off valve "C" and reduce the residual pressure. For this purpose, hold the hose of shut-off valve "C" in a measuring container.

-- Remove the : VAS6550 and then connect the fuel supply line.

-- Make sure the hose clamp is securely fastened.

-- Remove the rear bench seat REAR SEATS, REMOVING AND INSTALLING .

-- Fold the right carpet cutout to the side in direction of -arrow-.

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-- Loosen the nuts -1 through 4- on the flange cover.

-- Remove the flange cover.

-- Disconnect the fuel supply line -2-.

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NOTE:

Press the button on the line coupling together for this purpose.

-- Connect the :VAS6550 with the :VAS6550/3-4 and the : VAS6550/3-3 as shown.

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-- Open the shut-off valves "A and B" on the : VAS6550 in the direction of flow.

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-- Close shut-off valve "C".

-- Connect the Vehicle Diagnostic Tester.

-- Switch the ignition on.

-- On the OBD screen, press one button after the other: 01 - engine electronics and output diagnostic test mode .

-- Push the arrow button → on the display to the fuel pump electronics output diagnostic test mode .

The fuel pump must now accelerate slowly up to the maximum RPM.

-- Read the pressure on the :VAS6550 .

Specified value: 5.0 to 7.0 bar (72.51 to 101.52 psi)

-- Turn off the ignition.

If Target Values Are Achieved

-- Check the fuel supply line from the fuel tank to the engine for possible damage.

If Specifications Are Not Obtained Again

-- Make sure all couplings and fuel lines in the fuel tank and the fuel delivery unit are secure and not leaking.

If No Malfunction Can Be Found

-- Replace the fuel delivery unit. Refer to FUEL DELIVERY UNIT AND Fuel Level Sensor -G-, REMOVING AND INSTALLING .

NOTE:

If the :VAS6550 is to be removed, open shut-off valve "C" and reduce the residual pressure. For this purpose, hold the hose of shut-off valve "C" in a measuring container.

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