Wheres it leaking at? A pretty common area on our cars are the lines coming right out of the tank-the sending unit. They are hard to find in any junkyards because most of them destroy the tank as the car enters the junkyard, but I replaced my Camaro tank with one from www.gastanks.com
Ghetto trick #2541-good old Bondo works great to seal a gastank leak due to rust. Bondo is gasoline resistant and flexible, so it can be used as a temp fix when in a pinch. I've used it on beaters before & it lasted for 6 months plus.
(Leagle & moral disclaimer-you should really just replace a damaged tank. Do not use bondo on pressure lines of any sort. Always wear safety glasses. Do not drink gasoline, not good. Gas in the eyes hurts, but gas in your ear hurts like h#&!. 2x4, the Bonneville Club or any of its entities not responsible for any damage,injury,death or monetary losses due to this advise.)