Mysterious O'Ring in Gas Tank
The title pretty much says it all. I pulled the tank out of my 535i yesterday to fix some rust issues. Removed the pump cover with float & pump attached & drained the tank. Laying next to the plastic pump housing mounted to the tank floor I found an olive green o"ring that measures about 26mm id/33mm od. Nothing like this shows up in the parts fiche & I can't see anywhere it would fit. Any ideas??
90 535im
02 R1100S, 87 R100S
76 R90/S,73 R75/5
Alfa Romeos- 65 Giulia Spider Veloce
& 66 Duetto 1600 Spider