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  #1  
Old 06-24-2002, 08:25 PM
Ockman's Avatar
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Join Date: Jan 2000
Location: Valrico FL
Posts: 171
Important Tip on W210 Diesel Prefilter Change

Just changed both the main and pre fuel filters on my 210 and wanted to pass along something I learned in the process. When changing the fuel prefilter, you MUST remove the gasket from the old one or buy a new gasket which is a separate purchase from the fuel prefilter. Failure to do this will result in the engine burning the fuel already in the main filter (I filled it prior to installing it) and then stalling. Repeated attempts to restart will be unsuccessful because air is entering the system.
I don't know why they excluded the gasket from the prefilter itself but they did and it's not readily apparent. The good news is the old prefilter's gasket looked OK so I installed it, bled the fuel system and she's running great again.
I hope this keeps someone else from uttering a few choice words that would make a sailor blush when they 're doing some fuel system maintenance on their W210 diesel.
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Old 06-24-2002, 08:44 PM
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Join Date: Jul 2001
Location: Old Lyme, Connecticut
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Ockman,

Thanks for the helpful hint. I have yet to try this routine bit of maintenance on my car, with about ten thousand miles on the one presently installed. Now, if I can just remember the hint for that long.....

Thanks again, Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
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  #3  
Old 06-25-2002, 07:39 AM
LarryBible
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Been there, done that!

This is actually an O-ring. There is no need to buy a new one unless the old one is getting stiff or is flattening out.

I went through this during my first fuel filters change back in '96 when I had a new E300d. I almost emptied the battery before figuring out what I had done.

Good luck,
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