Question about 1997 Mercedes-Benz C-Class

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Air lock on diesel to engine on c 250 td - how do I solve

I dont have diesel to the engine - air lock - how do I fix

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  • 786saki Oct 26, 2008

    i have got the same problem with my Mercedes C 250 TD,1999. its giving me starting trouble after a Night Stay Over or any time stay over longer than 10 hrs or so.I have called RAC and they told me its air intake in fuel problem.Tried to get it fixed from a mechanic but still the same......Anyone got any other suggestion Please......

  • Anonymous Oct 27, 2008

    Hi Mate, I got the same problem with my C250 TD, it all started when I changed the diesel filter and run the car on nearly empty tank. Steps to fix long starting trouble
    1. Fill up the tank full
    2. Take the car upto 5000 RPM (20 seconds)
    3. In morning turn on/off heater 5 times and then start it without problem

    This works for me atleast !!Never let your tank go below 1/2 tank!!!



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the only permanent solution to your problem is to replace ALL the O-rings on the injection pump fuel lines. Don't forget the one behind the fuel cut-off valve as well..
This is the only soltion that really worked for me.

Posted on Jun 01, 2010

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Carry a large can of WD40 take off large intake pipe over the engine,get someone to crank up the starter motor,spray wd down pipe untill engine is running.then replace pipe,dont drop large jubile clip.

Posted on Nov 11, 2010


I exact problem replaced o rings and fitted a valve and aftermarket pump which draws fuel from tank now works fine.

Posted on Nov 02, 2008

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