Test Sequence:

WARNING: This page is about a different variant/trim than selected.

-- Activate the fuel pump using the output diagnostic test mode to build the fuel pressure.

NOTE:

The fuel pump is now activated to build up the fuel pressure.

If the output diagnostic test mode is performed several times in succession, it may be necessary to briefly start the motor before repeating the output diagnostic test mode.

-- Read the fuel pressure on the pressure gauge.

Specified Value: ≥ 4.0 bar (58.01 psi)

-- End the OBD and turn off the ignition.

Observe the decrease in pressure on the pressure gauge. After 10 minutes the pressure must not drop more than approximately 1 bar (14.5 psi).

If the Pressure Drops:

-- Check all of the fuel lines for leaks and damage.

If no Faults can be Found:

Fig 1: Identifying Shut-Off Valves A And B On Pressure Tester Kit

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Make sure that the drain valve -C- on the Pressure Tester -1- is closed.

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

-- Activate the fuel pump using the output diagnostic test mode to build the fuel pressure.

-- Close the shut-off valve -B- on the pressure gauge immediately after the pressure has been reached. The lever is perpendicular to the flow direction.

If the Pressure Drops Again (Leak on Fuel Tank Side):

Proceed as follows to check the fuel filter residual pressure. Refer to Checking the Residual Pressure at the Fuel Filter: .