The seals provided by the manufacturer of the sender have always been terrible. They always leak. I found a gasket sealer that I used last time and it worked great. I just took the sending out and it was not an issue having that sealer on it.
I did find that one of the vent tubes that was attached to the top of the tank is hanging down. I guess I will seal off the vent hose for that tube and call it a day.
Or I can turn it over and press it up against the top, stick my mig welder in there and tac it back in place.
Wonder who will not see that as a little humor, very little I know