Diesel Pump or what ?

[cisman]

I own a mercedes C 250D, its been running great so far. One morning it decided not to start, i detected an air leak into the fuel lines. After 2 days of diagnostics i was able to find a fuel leak at the joint between diesel pump and black plastic switch (not sure what this component is called).

Do i have to replace the whole pump or replacing the switch will solve the problem. Its the area marked in blue


thanx

 

[mattkh]

hi
I cant see what u call the black switch.
Anyway, clean the area then check exactly what is leaking. Then take the cheapest option first.

 

[sixpack]

fuel leak

Hi cisman

Yes the black box is an electric fuel shut off valve. If you take it off (2 torx bolts), you will see a short pipe going in to the main body of the pump. The O ring on this pipe leaks letting air into the system. Doing this will disturb all the other pipes you have to move, probably causing more leaks. Might be a good idea to replace all the pipes, (about 5) and O rings. Set of pipes from dealer is about £70. Standard fix for this thing. If its any consolation I had to do the same thing on my 2002 C270cdi, Merc havnt learned fron their mistakes !.

Peter

 

[Parrot of Doom]

You can order the o-rings for the pipes separately, which would be much cheaper than new pipes. I don't know the part numbers though.