Re: Fuel tank longevity
A bit late but .... you asked about PVC tanks and all I can say is DON'T!!! The tank on our 1986 PSC 37 was original but weeping slightly and obviously ready to let go. We had a plastic tank "welded" so we'd never have to worry about it again. WRONG. Two years later it sprang leaks in 11 different locations, some from poorly welded seams and some from cracks near corners and other stressed areas.
We just hauled the tank out and got a new one from Pacific Seacraft. It was a perfect fit and about the easiest job I've ever done on a boat (except for cleaning up the bilges, that is).
Jay, enjoying the lack of diesel smell!!!!
PSC #171, Kenlanu currently in Oriental, NC