Mercedes-Benz W210 inline pump diesel bleeding and starting problem
My W210 diesel does not start after standing or frost, what is the fault?
Usually air gets into the fuel system. The fuel drains back to the tank while standing, and O-rings hardened by the cold leak. If the engine starts once and the problem does not recur, the system bleeds itself. In frost, a weak battery can also prevent starting.
Where does air get into the fuel system?
Typical leak points are the O-rings of the fuel hoses and quick connectors, the seals of the filter base and filter, the covers and seals of the feed pump, and a leaking shut-off valve. The check valve of the return line or the supply side can also leak. It is worth replacing the O-rings and hardened hoses at the same time.
How do you bleed the fuel system of an inline pump diesel?
1. Fill the fuel filter with diesel before starting. 2. Loosen the injector lines slightly at the injector ends. 3. Have someone crank the engine until the air is out and fuel comes from the lines. 4. Tighten the lines and start the engine. Long cranking strains the starter motor, so do it in intervals.