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#1
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603 Question for psfred
In a previous post you mentioned checking an o-ring on the IP where the fuel prefilter connects to the IP. I looked at this today and want to know if the o-ring is held in place by a circlip which faces the front of the car. No fuel appears to be leaking in that area, so I'm wondering how this o-ring could be allowing air in the system but not fuel to leak out of it. Also, my friend said before the engine exhibited its start, run for 5 sec the stop routine, he noticed some hestitation when trying to accelerate.
Thanks for all the useful info thus far.
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99 E300 133K 98 ML320 99K 87 Saab 900 Turbo Conv 123K |
#2
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The o-ring in question is at the end of the hose with the pre-filter it in. It goes to the fuel heater on the rear outside of the IP, and the fitting swivels. I don't know how it comes off at the moment, only that there is an o-ring in there. Mine has fuel traces, so I will probably replace it shortly. I think this is the location you mentioned, and probably the circlip holds the fitting in.
A leak here will suck air both into the IP and back into the fuel line, and require several minutes of cranking (enough to flatten the battery) before you get enough fuel to start. You might want to watch for fuel moving in the pre-filter while cranking -- if you don't see any, you don't have fuel to the fuel pump, or the pump isn't working. A cheap and cheerful fix (to at least start the car!) is to rig up a fuel container with a hose fitting on it, then connect it to the pre-filter and hang in on the hood well above the engine. If that o-ring is leaking, fuel will leak out, and you will have a fuel supply to the pump while you crank. This will tell you both if the o-ring is shot and if your lift pump is working. If you still don't get fuel movement, connect the pre-filter to the lift pump (it sticks out at a right angle to the main IP) and see if you get fuel movement then -- if you do, the fuel heater is plugged. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#3
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psfred
Finally looked at the o-ring area on the fuel heater and it's as dry as can be, with no hint of fuel leakage so I don't think that's the problem. The vacuum switch was also good because the stop lever remains in the up position when the engine stalls and the key is in the ON position.
I think it's time to start looking for a good MB tech in the local area. Not easy at the "end of the road" in Key West FL. Many thanks for your help and advice.
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99 E300 133K 98 ML320 99K 87 Saab 900 Turbo Conv 123K |
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