3 years ago the tank in my '69 1 ton started leaking. Pretty big deal since its in the back of the cab. So I replaced the tank.
On the bottom of the old tank was an old JB-weld patch. I bought the truck in '93 so it was on there then. . . 18 or 19 years. But I wonder if it was really the ethanol in the gas that loosened it up.
Your post reminds me of the Auto Mechanics shop back in the 80's. I broke a float lug off on a carb. in a volkswagen rabbit. My teacher told me to take it and show it to the instructor in the welding shop.
The old guy-probably 60+ years old- builds up the area with something he called 'sil-fos' or some such, cuts it back to shape with a Dremel Tool and drills a new hole for the float pin.
It worked fine.