CDI hard start - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 12-29-2009, 08:30 AM Thread Starter
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CDI hard start

MY 99 220cdi have trouble starting after about 8 hours not driving, i have change all the o-rings in the fuel line, when i stop the engine i can see the diesel running back in the tank, i can see air coming in the fuel line after the shot off valve (a6110780049) can it be fault ? ore what can i try ?
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post #2 of 8 (permalink) Old 12-29-2009, 11:56 AM
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This does sound like a leak at the fuel lines. Can be difficult to find, I wish you luck. Perhaps the W210 section could help with their experience.
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post #3 of 8 (permalink) Old 12-29-2009, 01:20 PM
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Not too many cdi in W210, but leaky fuel lines on older diesel have whole book of topics.
The constant advice I am giving to fellow owners of aging diesel engines is to get whole set of plastic tubings with oring on them and replace them all at one time including oring on SOV.
On older diesels (not cdi) parts cost around $80 from Internet dealer.

Last edited by Kajtek1; 12-29-2009 at 01:23 PM.
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post #4 of 8 (permalink) Old 12-30-2009, 11:52 AM Thread Starter
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One way valve

Changed all the fuel lines and o-rings without any luck, mounted a one way valve just before the fuel filter and that solved the issue.
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post #5 of 8 (permalink) Old 12-30-2009, 11:59 AM
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Originally Posted by ospdk View Post
Changed all the fuel lines and o-rings without any luck, mounted a one way valve just before the fuel filter and that solved the issue.
Sounds odd, unless there was a leak exactly at those hoses. Do you mean the fuel line from the tank to the fuel filter or the fuel line from the fuel filter to the tank? Or perhaps at the other side of the fuel filter? I'd like to understand why the valve made this difference.
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post #6 of 8 (permalink) Old 12-30-2009, 12:20 PM
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The valve might be a patch downstream from the leak.
The leaks on fuel lines operating at vacuum is hard to detect even with clear lines that are there just for that.
IMHO the main problem still exist and at one point it might become big enough to trigger a problem where check valve will not help.
I am not familiar with fuel lines on the cdi engine, but on older diesel common problem is that owners replace all the fuel lines with orings on them and have no idea there is 1 more oring hidden on other side of SOV.
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post #7 of 8 (permalink) Old 12-30-2009, 01:26 PM Thread Starter
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Valve

I placed the valve just before the fuel filter from the tank (between fuel cooler and filter) in old models there was a one way valve inside the pump don't know if it is the same with this one, and that is causing the problems.
When i turn of the engine i can see the fuel running back about 10cm from filter to tank, and over night that become more and causes the problem starting.
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post #8 of 8 (permalink) Old 12-30-2009, 02:22 PM
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Doesn't that mean a leak at the other side of the one way valve, the valve prevents the small vacuum at the tank draining the fuel from the line? If there was no leak, the vacuum would be equal at the return line and it would prevent the fuel movement you observed?
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