SuperHans

Active Member
Joined
Apr 30, 2016
Messages
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Location
Walsall
Your Mercedes
W203 c270 cdi 2004
Hello all. I have rough idling and occasional slow starting in my c270 cdi so I took your advice and replaced the o rings.

I changed 4 of the o rings today, the one by the fuel filter, the rail and the 2 on the fuel pump. It seems to be slightly better now and there are no bubbles when it is idling. However, when I put my foot down I can see some bubbles in the fuel line by the fuel filter - so perhaps it is air in the pipes that has been causing the trouble all along. Now, the air is only visible in this fuel line, I can't see it in the transparent one on the fuel pump (the one not connected to the fuel filter). Sooooo does this now point to exactly what line needs changing? Which one do you suggest? Thanks!
 


Mercedes-Benz Servicing, repairs, engine and diagnostics
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