Mercedes-Benz W163 CDI: air in the fuel line, engine does not start properly
ML 270 CDIML 400 CDI
Why does a Mercedes-Benz W163 CDI start poorly or stall immediately?
The cause is often air in the fuel line. The engine needs long cranking, starts and then stalls right away. Air gets in through a leak on the low-pressure side, before the high-pressure system.
Where does air usually get into the Mercedes-Benz W163 CDI fuel line?
The most common leak point is the filter connection. Others are the pressure regulator O-ring and support ring, a damaged hose and the O-rings of the tank transfer pump. Hoses often crack at the ends or under the protective sleeve.
How do you seal the tank transfer pump quick coupling?
1. Carefully open the yellow lock of the quick coupling. 2. Replace the pump's two O-rings and the washer between them. 3. Choose the green O-ring as the new one. 4. Put the yellow lock back and press the locking tube closed. Work on the high-pressure side belongs to a workshop.
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