JB weld is not the best solution (replacing the tank is), but I will let you know that it does work. On my car I developed a crack at the bottom of the tank and used JB weld to repair it after running the car low on gas and letting it idle to dry. I basically just cleaned around the crack, sanded it to a shine, JB'd it up, sand, repeat, sand repeat until the tubes were gone. After about a year it would fall apart due to either gas exposure or the filling/emptying cycle cracking the JB weld. I eventually just replaced the tank with one I found on eBay, and have had no leaks from the tank since. You may never have a problem with it since yours is on the top of the tank, but you may want to keep in mind that it could wind up failing in a year or two or ten due to exposure to gas.
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