Finally getting to it!!! 1970 Duster 340

I’ll have to empty that box, mine was around the fuel sending unit seal, when I removed the sending unit it all looked normal. The new gasket that came with the tank seamed the same thickness and the locking ring seemed fine so the only fix I could come up with was something I would not normally try was to double up the gaskets, I still had my original one. When I locked that in placed the two gaskets seemed to work and it’s not been a problem since.