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Old 09-24-2003, 08:51 AM
Registered User
Join Date: Sep 2003
Location: Kansas City
Posts: 37
'95 E300 Diesel fuel leak @ shutoff valve

Have developed a fuel seep out of what appears to be vent holes on the fuel shutoff valve. Fuel filter is tight & not leaking. Not a lot of fuel, but enought to be a dirty mess. No apparent correlation between operating condition (temp, speed, etc) and seepage. Notice a thread was started on this topic a while back, but no resolution.
Thanks for any ideas
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Old 09-24-2003, 11:45 AM
Mark Herzig's Avatar
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Join Date: Apr 1999
Location: Austin, Texas
Posts: 380

No suggestions but I'll be interested in what this thread turns up. I have been smelling diesel after the car sits up in the garage all nite. No apparant leaks on a cursury inspection... Do you do your own fuel filter replacement?
Mark Herzig
1995 E300D 153K
1985 300D 142K (sold)
1979 450SL 122 miles (sold)
1992 500E 127K (sold)
1987 300SDL 132K (sold)
1986 300E 161K (sold)
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Old 09-24-2003, 12:12 PM
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Join Date: Sep 2003
Location: Kansas City
Posts: 37
I did replace the fuel filter & o rings as soon as I notice this seepage, just to make sure things were all right. No difference.

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Old 09-24-2003, 12:23 PM
steve hutson
Posts: n/a
I had a similar issue on my '95E300D that was traced to the O-rings on the fuel lines coming into and out of the fuel filter housing and on the injector pump. Replacing the O-rings alone didn't cure the problem. Apparently, the plastic parts on the fuel lines where the O-ring sits had degraded with heat and age, and the new O-rings wouldn't seal. In my case, several of the lines were obscured by the intake plenum, thus hiding the leaks. Once the new lines were in--no leaks and no overnight fuel odor. Interestingly, my fuel smell was in the trunk after sitting overnight, eventhough no leak was found there. Also, the O-rings on the bolt that holds the fuel filter cannister to the housing get old. You get new ones with a new fuel filter, but this step gets overlooked sometimes.
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Old 09-25-2003, 09:57 AM
DR.DIESEL's Avatar
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Join Date: Mar 2003
Location: Puget Sound, Washington St.
Posts: 522
I have seen this before. For some reason, the shut-off valve
develops a small internal leak. Sometimes if you twist the valve completely shut and then re-open it, it will either stop the leak or make it worse. You have a 50/50 chance.
For saftey sake, I have always replaced these when they start leaking.
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Old 09-29-2003, 07:09 AM
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Join Date: Sep 2003
Location: Kansas City
Posts: 37
Thumbs up Problem resolved

Steve- got to looking at the lines and the o-rings. Found one that was seeping, so replace the entire lot, lines with new rings on them. That is some kind of fun working under the intake manifold. BTW, one of the lines has been subbed to a banjo bolt termination on the injection pump.

Dr.Diesel- lost on the 50/50 with the shut-off valve. New one fixed the problem.

I still kind of find it odd that I managed to have both these leaks at the same time, but I must be lucky like that. Put a couple of hundred miles on this weekend and not a drip.

Thanks to you all

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