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· You should listen to me. No, seriously, listen to
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I think the larger line is an overflow/rain drain from the area around the gas cap. You can confirm that by locating the hole there, putting something like gas or water down it, and checking where it comes out. If it is, the tube in the tank is probably cracked or rusted through. Pressurize it and locate the leak point. Some epoxy might seal it.
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