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C250TD Irregular Idling

PhilipT

New Member
Joined
Feb 16, 2012
Messages
3
Location
Pretoria South Africa
Car
C250TD and C180K Sportpack
My C250TD would idle smooth when cold however after driving it for about 50km the idling would sometimes be irregular. I had the plastic pipes and o-rings replaced but without luck. When I rev it up it smooths out again. Could it be the lift pump? Your comments / advice would be highly appreciated.
 
do you see any air bubbles at all in the clear fuel lines? if there are still bubbles, then it means the new orings are not seated good enough and are letting in air, or the main rubber fuel pipes are letting in air. these can go brittle at the ends, quick fix is to either replace the pipe or cut 1inch off the ends.
 
I will check again, the previous time I did not see any. Something I forget to mention is that it is more likely to happen when the fuel level drops to below 1/2 a tank.
 

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