Question about 2003 Mercedes-Benz C-Class

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Mercedes2003 220cdi automatic

Starts runs3-10 seconds cuts off have problem re starting once started will start all day diagnostics show no faults

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Looks like you are getting some air in you diesel pump.
whet it sits diesel goes down creating a bubble.
when you start it the bubble goes in, there is when it stalls, and you got rid of the air, then you crank it again and everything ok. because there is no more air in the system.
probably you will have to have the pump serviced to replace all the o-rings and seals, they will re-calibrate it as well.

Posted on Jan 08, 2009

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Had the same problem on my C270. It only seemed to happen on cold winter mornings and was fine all summer. Mercedes replaced loads of stuff under warranty, but it turned out to be some flexible pipes which had gone stiff and were letting air in, and hence the fuel drained back to the tank. It would only restart after cranking for a long time.

Posted on Apr 20, 2009

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Remove engine covers, Pull back the shrouding on the pipe which goes from the fuel filter housing to the low pressure pump ( the one that sits above the main pump. Is there fuel in that pipe at the time which the vehicle fails to start? Replace o-rings on pipes.
Good luck!!!
Carlo@SS

Posted on Mar 31, 2009

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