Having a problem since replacing the spin on fuel filter on my 1980 300SD. Fuel is leaking from around the head of the hollow bolt at the top of the housing for the spin on filter. Visited the local parts department of the MBZ dealer and purchased a new "O" ring and copper washer for the bolt to see it that would stop the leak. No luck! Still have fuel seeping out around the bolt head. Any thoughts about how to stop this leak?

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• 2001 E320

It will stop leaking when you have it tight enough.

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Jim

I was concerned not to over tighten the bolt. Someone else told me to mark the bolt before removing the old filter and to return the bolt to the same position after replacing the filter. Does it matter if the hole in the bolt ends up at another spot when the bolt is tightened?

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• 2001 E320

nope, not at all. Keep in mind too that it is screwing into the top of the new filter. It ain't like you are tightening it into a cylinder head or something.

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Jim

Mine did the same thing until I really tightened it down. In fact , surprised me how much torque it took to stop it from leaking.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I put some muscle into it and it appears so far that the leak has stopped. Thanks for the feedback.

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• 2001 E320