Mercedes C220CDI Not starting Help please

batchy

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c220 cdi estate 2001
Hi All

I have recently had an issue when the car would crank but not start. It had a quarter of a tank. I put some fuel in and it spluttered into life. I have kept the car topped up with fuel since and all was fine. Today after being sat up for 12 hours it started then died. Then wouldnt restart it has 3/4 of a tank.

After about 20 seconds of cranking it started. I have read alot about the high pressure pump which i believe is the culprut. There is fuel to the filter which is fairly new and no air bubbles iin the fuel line injecgors are fine etc, however i noticed the clear pipe under the high pressure pump was half full of fuel so i believe i have a leak back on it.

Has anyone else had this problem and is it a case of changing the pump? or os there an easy fixl? it isnt leaking fuel. I go away on friday for two weeks so the car will be sat at the airport so need to fix it before !!

thanks all i have attached a picture showing the pipe that was half full to the left of the black line to the right was empty.
 

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Paul1948

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S320 CDI 2003
Take a can of Easy Start with you as it sounds as though you have pressure leak of from the common rail, possible a faulty injector or seals failing in the fuel line ( letting air in but not fuel out). Enjoy your holiday.
 

turbopete

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^^^^this^^^^
 
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batchy

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Great thanks guys will take easy start with me and have a look when I'm back.! Will a pressure test be the best way for injectors? Whereabouts are the seals to check.? Presume the seals are the cheapest easiest place to start! ?
 

v8disco

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2012 CLS 350 cdi Blue efficiency
When I had a couple of D5 volvos, the early models were notorious for this and it was usually a failed injector that caused it. The way to test the injectors was to, one at a time, remove the leak off tubes and run the engine. If you got virtually no leak off, it was fine, but a jet of fuel indicated it was faulty. Change the injector and all was good. Various people suggested that they should be coded to the car, but I bought a new Bosch unit and it just worked. Apparently a lot of leak off means the rail takes a time to build the pressure needed for the engine to start. Might be nothing to do with your problem but thought I would share anyway .


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turbopete

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seals are commonest on these. basically all the rubber o rings on the pipe unions etc.
 
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batchy

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Hi I thought I would update as it may help someone else. The car has been used all the time so has started ok until one morning when it was freezing. I decided to investigate and didn't take long to find the pipe from the fuel filter to the pump on the front was sucking in air and when turned off was allowing fuel to return to the filter all other pipes are ok.
I also noticed the pipe was broken at the fuel filter as it was cable tied on i presume by the german car specialist that had serviced it all its life ! Pretty poor considering the pipe was only 16 quid and you would have thought they would have replaced it. So far so good. Big thanks to other posts about injector seals as that's my next job and there is some great advice !
 

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