Sending Unit Gasket Leak

[bobj]

Originally Posted by DUKE

When I fill my gas tank to the top, gas leaks out through the sending unit gasket.
It is was installed without gasket cement, using the rubber gasket supplied only.
Stainless screws are self tappers directly into plastic tank, original threads are shot.
I know the easy answer is to not fill the tank, but I want to prevent water from leaking in also.
Suggestions? (see picture)

The original nuts/threaded inserts are brass and molded into the tank. The original inserts will probably be covered in corrosion. Spray them with penetrating oil and use a dental type pick to clean them out. they are about 1/2 in deep. when you can see them clearly, run a flat bottom tap through each one Carefully, Slowly. backing it out often to clear the crud. dont push it too far. spray frequently while doing this. IF the inserts are damaged you may have to go slightly larger. get stainless screws to replace the lost originals.
it worked out fine and i put it back together a new gasket and without any sealant. sealant is not recommended on these rubber gaskets.
hey anybody here know the size of these brass inserts and the original screws?