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The tank repair kits found just about anywhere actually do a pretty decent job as long as the leak isn't on the very bottom with all that weight sitting on top of the repair.
Depends on where it is, and how bad. If its a 4 wheeling/Rock Crawling gash, not to big, I have heard, LOL, of trimming a piece of soft wood to wedge in there to slow the flow.
If its a rust area leak like from under the bottom support straps where the rubber
anti-chaff material has worn off. Drop tank, clean the heck outa that spot, down to bare metal.
CAREFUL USING A ABRASIVE GRINGING WHEEL/SPARKS GAS FUMES DO NOT MIX!!
And JB weld the heck out of it, replace the worn rubber pad material (old inner tube will work).
Years ago I drained the tank, cleaned the area and used JB weld, with a piece of plastic milk jug stuck to the glue over the rust hole. That "fix" lasted several years while I owned the truck, and as far as I know is still holding.
This is going to sound odd, but years ago my bro poked a 5/16 inch size hole in the bottom of the tank. Gasoline was running out in a steady stream. My grandfather came out with a tube of "seal-all" glue he used to rave about that he got at the grocery store. It claimed you could patch gas tanks. So he took a big gob of that stuff, and smeared it over the hole while the gasonline was running out. I laughed at him and jokingly accused my grandfather of being senile. That tank is holding gasoline to this day.