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Plastic tank or metal? I've heard of plastic tanks swelling from the ethanol in the gasoline but have never seen a example of it happening enough to make a tank leak. I'd pull the tank if necessary and see were the leak is coming from and if possible, what caused it. It could just be a bad seam weld.
Also, could it be a bad gas cap gasket? I've had them get dry rotted and let a bit of gas leak out while gas was splashing around in the tank.
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