JPhil
Huh?
I'd say hit it with a wire brush in your hand drill. Get one with a threaded shank and make an extension with a bit of all-thread & a long all-thread adjuster nut. (Use the brush without the extension for the first couple inches so you don't have worry about it slipping out near the ends and flying across the garage--don't ask me how I learned that...)
There is also a gas tank sealer product I used to use on old rusty, corroded motorcycle gas tanks. Pour it in, roll the tank around to coat the inside, pour out the excess, let it dry. Makes a gasoline proof coating. You could coat the inside of it with that stuff to keep further rust & degradation of the filler neck from contaminating the tank.
There is also a gas tank sealer product I used to use on old rusty, corroded motorcycle gas tanks. Pour it in, roll the tank around to coat the inside, pour out the excess, let it dry. Makes a gasoline proof coating. You could coat the inside of it with that stuff to keep further rust & degradation of the filler neck from contaminating the tank.
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