Looking on the top of your fuel filter housing is a MB part # starting out with 615-xxx-01-xx and this one uses the one "O" Ring and Crush Washer.

The later up dated filter housing has a Part# of 615-xxx-02-xx and uses the 2 "O" Rings and NO Crush Washer.
If you have this one and are using a Crush Washer, this might be why you have a leak, the "O" Rings are not seated because the CW has raised them a bit from their seats.

It might be 1983 this was changed.

X 2 on using an aluminum washer, it would be softer than the copper to make a good seal.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works