Problem #1 The new sediment bowls from China tractor parts as sold at TSC and many other sources are pure trash. I bought 4 before I had 1 that would seal, shut off and turn on without leaking.
Problem #2 Something in todays fuel hates the gaskets. The black colored gaskets swell up. The cork gaskets shrink.
There is no fix for problem 1 except to find an original equipment or older replacement bowl that will work. I have not found a fix for problem 2 except to have a supply of replacements handy. Lucily the gasket is only a couple bucks or I made up a set of dies and have lots in stock at the shop. Sealer goop wont fix your problem