Assume you damaged the gas tank. If you broke a line or filler neck this won't work.
Raise vehicle (safely) and clean tank - careful not to spark - NO GRINDING. I use regular sand paper. Find the hole - sometimes takes a bit of looking. If small, here is an old trick: rub the corner of a bar of soap over the leak and if done correctly, it will stop the leak (no, you're not done). Clean the area around the leak a little better - still careful of sparks. Get some epoxy that will stick to metal wet with gas (from AutoZone). Seal the hole with this epoxy and you should be good. Work quickly - the working time of the epoxy is less than they say it is.
good luck.
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bottomed out my car over a bump in the road and now there is a gas leak.
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