I did mention using JB Weld to solve this same problem years ago, didn't I? JB Weld is resistant to gasoline...even ethanol laced gas. 7 years ago I mixed some and thinned it with acetone enough that I could paint the inside of the gas tank on a log splitter. Still working just fine. JB Weld now even makes one type designed just for gasoline. One important thing to remember is you ideally should have no more than 4 psi on the high side as far as fuel pressure goes. Any way you go, good luck!
