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Hi Welcome. That sounds like a nice 18 Outrage you have in the family.

It will be difficult for any of us to give you a definitive answer about the source of the fuel leak. We can speculate about possibilities, but only an inspection will determine the cause. It could be old hoses, or equally possible it could be a leak in the tank. Most people try to i.d. the source of the leak, and failing that begin by replacing hoses.

At nearly 30 year sold, the tank has already given good service life. So don't feel too badly if you end up having to replace it. In fact, you may want to consider replacing it regardless. Even if the tank is not the source of the current problem, if you have to really tear into things to find the source of the leak, are you going to want to have to do that again in a few years?

No matter what, you have to run this down. Leaking gasoline and associated fumes in sealed compartments below decks are VERY dangerous, and you risk an explosion if you don't get the problem solved quickly. Also, there should not be any "overflow lines" on fuel tanks. But the air vent may allow some fuel to leak out if the tank is overfilled -- which should be avoided!