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#1
11-02-2001, 05:17 PM
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Fuel Leak!
I finally got the fuel filter loose and changed it. I also found out why someone had put it on so tight, I can't get it to quit leaking. It doesn't leak around the gasket but the bolt on top leaks just a little bit, getting it tighter doesn't seem to do any good and I don't want to get it so tight I won't be able to get it off again. Anybody have an idea what the problem could be and how to fix it?
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k 
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#3
11-02-2001, 06:30 PM
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Yup, just like Sixto showed you. Go to a Kragen or any parts store and look for orings.. I lucked out and the guy just gave em to me.
 Good luck, I hope this fixes your problems. BTW make sure the new orings aren't too thick. Mine were a bit thicker and I had a hard time screwing the bolt into the filter.
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96 Legacy LSi wagon 92 Mitsu Expo 95 525iT 1983 300TD clackclackclack sold 1972 Toyota Corolla wagon TE28 sold 1991 Galant VR4 pshhhhh non-op 1989 Montero RS pop's ride
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#4
11-02-2001, 08:19 PM
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Thanks, the old rings must be pinched because the bolt doesn't want to come out, I'm sure new ones will fix it.
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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#5
11-02-2001, 08:36 PM
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More likely they are rock hard!
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!
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#6
11-02-2001, 09:09 PM
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correct seals
The big screw that holds the main fuel filter is supposed to have a metal seal ring just under the head of the bolt on the outside of the filter holder housing, and a rubber ring on the shaft of the bolt next to the filter. About 40 cents each at Performance, probably a buck each at the dealer.
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1984 300TD Wagon, 407,800 mi (current daily driver) 1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)
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#7
11-03-2001, 11:57 PM
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Are you sure it is supposed to have a metal seal. I asked about that on this board and one replied that there are no metal seals and to just replace the orings. Cured the leak.
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96 Legacy LSi wagon 92 Mitsu Expo 95 525iT 1983 300TD clackclackclack sold 1972 Toyota Corolla wagon TE28 sold 1991 Galant VR4 pshhhhh non-op 1989 Montero RS pop's ride
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#8
11-04-2001, 12:13 AM
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yes, I'm positive
If you put an O ring under the head of the bolt, it will compress and distort when you try to tighten. This is just like any drain plug...they all seal with a metal ring just under the head of a bold between two contact surfaces. O rings are used to seal things that pull together without twisting motion. Metal seal rings are used were contact surfaces twist while tightening...such as with drain plugs, and this filter screw.
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1984 300TD Wagon, 407,800 mi (current daily driver) 1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)
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#9
11-04-2001, 04:40 PM
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Every one I've ever seen has a copper ring under the bolt.
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!
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#10
11-05-2001, 11:54 AM
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Thanks a lot. I'll look for a washer or my filter bolt.
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96 Legacy LSi wagon 92 Mitsu Expo 95 525iT 1983 300TD clackclackclack sold 1972 Toyota Corolla wagon TE28 sold 1991 Galant VR4 pshhhhh non-op 1989 Montero RS pop's ride
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#11
11-05-2001, 01:00 PM
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go to a dealer
Just to clarify....dont just use any washer.....a sealing ring is soft metal...usually copper. The washer "crushes" and fills voids as you tighten ...that is how it seals. Dont use a steel washer....won't work!
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1984 300TD Wagon, 407,800 mi (current daily driver) 1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)
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#12
11-05-2001, 01:42 PM
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Will do, thanks a lot Mark.
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96 Legacy LSi wagon 92 Mitsu Expo 95 525iT 1983 300TD clackclackclack sold 1972 Toyota Corolla wagon TE28 sold 1991 Galant VR4 pshhhhh non-op 1989 Montero RS pop's ride
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#13
11-05-2001, 06:12 PM
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Modified fuel filter housing!
Go into your local MB dealer and order a modified fuel filter housing and the bolt that goes with it. Rather than using a sealing ring at the top, it's a new type which just uses o-rings. The through-hole that the bolt goes through is tapered and it stops leaks. Your parts guy will see on his computer that the original part # supercedes many times.
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Regards, Aaron
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#14
11-05-2001, 06:40 PM
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Aaron, I think I have that kind already. Mine has two orings, one smaller than the other and the bolt is tapered. If I do have the newer style, do I need to add a washer? Thanks.
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96 Legacy LSi wagon 92 Mitsu Expo 95 525iT 1983 300TD clackclackclack sold 1972 Toyota Corolla wagon TE28 sold 1991 Galant VR4 pshhhhh non-op 1989 Montero RS pop's ride
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