The Aluminum crush washers used on the OM617, OM616 and likely other Mercedes is a common spot to have a slow fuel leak.
Many times that crush washer doesn’t seal up quite 100% so it seeps fuel.
There is also a later version of the housing (02 style) that uses 2 o-rings instead of a 1 o-ring and a crush washer to seal, but sometimes those housings would seep too.
Here is a super simple and cheap way to stop those pesky fuel leaks.
| Things in this article/video |
|---|
| 01 Style housing: |
| M2.5×10 O ring Bonded Washer |
| 02 Style housing: |
| M2.5×10 O ring M2.5×14 O ring |