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Old 02-21-2004, 06:15 PM
Aaron's Avatar
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,937
Interesting point about slow diesels

Had an '84 300SD in at the shop today and the owner was complaining about very slow acceleration. So I took it for a test run and the car literally would "crawl" when the accelerator was floored. So we inspected the fuel system and found that the smaller of the two rubber o-rings on the hollow bolt that the main cannister filter screws onto was deteriorated and had blocked the inlet for the injection pump! I have never seen this before but I wanted to warn anyone who might ever experience deadly slow acceleration to check the o-rings on the hollow bolt. While we were in there we put a set of fuel filters on as well. Drove it and it was back to normal.

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Old 02-21-2004, 06:31 PM
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,363
Thank you

Hello Aron
Your warning is appreciated.
Have a great day.
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Old 02-21-2004, 10:00 PM
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Location: Portland, OR
Posts: 306
Did you replace the rings with some material other than rubber, like something less likely to deteriorate?
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Old 02-22-2004, 12:00 PM
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Join Date: Dec 2002
Location: Annapolis,Md
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Two new rubber O rings should come with a new fuel filter. I actually only replace mine every second fuel filter change. Aaron's comments may make me rethink my procedure.

Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback
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