My 20+yr aluminum diesel tank developed a slow leak this past season. I get a small amount of fuel in the bilge after a week or so on the mooring, especially after I top off the tank. I thought I should repair this asap.
I though I might access the tank through the sending unit opening, drain the fuel, clean the insides, and find the hole or crack to seal from within. The problem is, the opening at the top is so small, I can't really see much inside. To make things more difficult, the fuel tank is completely glassed-in under the port lazarette, so there's no other access.
So here's the question: do I cut out old tank out and replace it (a big messy job), or can I just leave it there (empty, of course) and buy a Moeller-type tank to install above the old one. I have room above the old tank, inside the lazarette next to the holding tank. Is there any problem leaving the old tank where it is? I'd rather not cut any fiberglass if I dont have to.