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Home >> Volkswagen >> 2023 >> ID.4 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Fuel Supply (Fuel Supply - Gasoline Engines)) >> 20 Fuel Supply >> Fuel Pump >> Transfer Fuel Pump -G6-, CHECKING >> Residual Pressure, Checking >> If the Pressure No Longer Decreases (Leak on the Engine Side):

If the Pressure No Longer Decreases (Leak on the Engine Side):

WARNING: This page is about a different car, the 2023 Volkswagen Atlas. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

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

-- If there is a leak on the engine-side, check the fuel pipes and high pressure pump for leaks.

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

-- Remove the spark plugs.

-- Open the shut-off valve -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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