robricc

I just changed the fuel filter on my 1999 E300. I got a Mahle unit to replace the MB filter on the car. When I took the MB filter off, I don't see any o-rings to replace, but the Mahle came with 2 different sizes inside the box. I am not sure where I should put these, or if I need them at all.

The car is currently having trouble starting. I presume this is because I broke the fuel line going into the prefilter, so I can't comment if the main fuel filter is working at all. Hopefully I can clear this all up tomorrow...

Thanks.

johnshasteen

I always helps when replacing the main filter, fill the new filter up with clean diesel fuel before you install it - it's that much less priming that has to happen.

robricc

Thanks for the tip, but I've already got that covered.

When picking up a new fuel line from the dealer, I had them print me an exploded diagram of the fuel filter assembly. Looks like the o-ring(s) that come with the fuel filter go on the bolt. I'm not sure why I didn't see them before...