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Home >> Volkswagen >> 2017 >> Passat R-Line >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Fuel Supply System (General & Service Information - CBTA, CBUA, CDVB, CPKA, CPRA, CCCA, DDSA, DDSB) >> 20 Fuel Supply >> Fuel Pump >> Transfer Fuel Pump -G6-, CHECKING >> RESIDUAL PRESSURE, CHECKINGTest Sequence: >> If the Pressure Stops Decreasing (Leak on the Engine Side):

If the Pressure Stops Decreasing (Leak on the Engine Side):

NOTE:

Check for the leak on the engine-side. Repeat the residual pressure check. Close the shut-off valve -A- this time to determine if there actually is a leak on the engine side.

-- If there is a leak on the engine side, check all components externally for leaks.

If no malfunction is found, check the fuel injectors for leaks:

Engine Codes CDVB, CPKA, CPRA: 

-- Remove the spark plugs. Open the shut-off valves -A and B-. Activate the fuel pump with the output diagnostic test mode.

-- Check through the spark plug hole if fuel is collecting on the piston crown due to a leaking fuel injector.

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