OM606 prefilter leak

[beerlover]

95 E300D. I have a leak at the prefilter. I took the bolt off and removed the fuel line to have a look. The o ring on the fuel fitting looks O.K., but I will be replacing it anyway. I've searched through the threads on this forum and it appears that there are 3 o rings involved in that prefilter. Can someone give me a diagram or description of where each of them is supposed to fit so I don't skip one? The fuel seems to be coming out from where the metal housing meets the plastic part that the fuel fitting snaps into.

[KarTek]

This diagram is for the later 606 but I believe the filter assembly is the same as yours.



I'm pretty sure there's only 2 O-rings on the pre-filter - the one on the inlet line #32 and the one around the larger part of the filter - #29.

[Jeremy5848]

Perhaps you recently replaced the pre-filter and didn't replace the o-ring? Pre-filters don't automatically come with new o-rings, you have to ask for and buy them separately. It's #29 in the diagram, goes in a groove on the pre-filter, then the pre-filter is pushed into its hole.

[F18]

Its hard to determine if the ring is OK by eye......they just loose their elasticity with age and deform and end up with a permanently flattened contact area around the perimeter. The cold temps where you live probably shrinks it up to the point where the slghtly stiff & deformed "O" ring looses its seal.
Cheap fix......just replace occasionally and you should be good to go anywhere!