If you want water in your gas, they are fantastic. See how the pick up assembly sits in a little sunken area? Combine that with an almost assuredly bad gasket and you have a rain water FUNNEL. If you are going to use that tank, at the very least, replace that gasket before it bites you in the butt. (If you can even still GET them.) Back when those tanks were popular, I can’t even begin to say how many engine problems we had, because of them. Even if you don’t leave your tank out in the rain, the ethanol gas will draw moisture form the atmosphere, though that failed gasket.
Long live American manufacturing!