Interior Access Panel to Sending Unit in 70 Duster?

The sealer is like silicone when cured. It can be opened up with a hair dryer or heat gun. It was a last resort for me. I too was tired of the tank leaking fuel, it won't leak again. I shouldn't ever have to deal with it again. Had the other tank out several times trying to stop the leak, before I realized what was wrong. This was the first time that the SS tank leaked in a year, like I said, last resort. The tricky part with the sealer was being tidy with it on the install. Nailed that part.
Good luck sir!