Re: Life of a fuel tank?
If it's that old, I would recommend pulling the tank for a thorough visual inspection. It could also be inspected in situ using ultrasound, like they do for underground tanks in gas stations. I have not heard of this being done on boats, though. Thirdly, you could have it pressure tested. This is how USCG certification is done on new tanks. The new double clamps and hoses are a smart idea.