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Although this should be just for a temporary fix only, you can buy a product called Seal All or JB Weld, which are products that are epoxy-based. They will help seal the hole if it is not too large. You might eventually end up needing to replace the tank.
Mix the epoxy as directed on the package and apply it to the hole. If there is gas leaking from it, that is fine because the epoxy automatically seals when it is wet. You will want to stick it where the puncture is located and it will form a seal. There are patch kits out there that are used for instances such as this, but this is not a permanent fix. -
Welding is another option if you or someone you know has the experience. Welding should only be done when all the gas has been drained and the tank is rinsed out. You do not want to weld if there is any signs of gas, due to the fact any sparks may ignite.
Remove the gas tank and empty what gas is left. Rinse the tank well and allow the tank to dry or wipe dry. You will need a sheet of metal to fit over the hole. You will then weld this metal to the metal gas tank. Welding can only be done on gas tanks that are constructed of metal. -
The best and safest way to fix a punctured gas tank is to have it replaced. This will cost you more, but will be safer and will result in a longer lasting gas tank, which in the long run will save you money. Metal gas tanks have a tendency to rust and corrode and will eventually have to be replaced anyway.
You will have to remove the gas tank, empty the gas from the tank and rinse the gas tank well. You can go to a dealership or a junk yard to find a good gas tank and have it installed by a professional. If you have experience in installing gas tanks, you can do this yourself, it will save you some labor costs.
