Wow...
What a job to tackle. I had a recent experience of a much more minor nature myself.I am actually going over the wall, so to speak, as I have sold my L25 and am buying an S2 9.2A (30 footer). During the survey, one of the things the surveyor found was a leaky fuel tank. The leaks were on the underside of the aluminum tank. The leaks could be attributed to two causes. The ones the surveyor found he attributed to water congregating at the low end of the tank. Since the boat was slip kept, the tank was not well mixed and he said that this a lack of fuel turnover led to the pin-holing. The owner tried to patch the pinholes for me as a temporary repair (by the way, the surveyor whole-heartedly recommended plastic over aluminum for tank material), but to do so ended up pulling the tank. He then found further pin-holes under the tank where the metal straps would have covered them, perhaps harboring condensation.I am certainly viewing the epoxy repairs only a stop gap. Luckily for me, range isn't an issue for a 30 footer, where as it certainly is for your 45 footer. I am wondering if you ever considered a two tank system? For me the biggest shark to jump in the new boat is going from gas to diesel. Everything I have read says that a healthy paranoia about fuel filtering and quality is a must. Given that I day sail most of the time and typically used only 5-10 gallons of fuel with an 8 hp outboard, it seems that a smaller tank would promote more fuel turnover, but be a hassle if I ever do any cruising. I could put in two small tanks, but needless to say that would complicate the plumbing a bit. I could put in a larger tank, but not fill it all the way, but the increased head space might not be healthy (it would promote mixing, but if the algae that grow in diesel are aerobic, it would promote growth).In my case, the plastic tank would preclude any worries about pinholes, but if water were a big concern I could add a purge valve at the low point of the tank to allow me to drain any settled water out of it easily.Did you take any actions to prevent pinholes in the future? Your tank lasted a good long time, so chances are you won't ever have to worry, but I am just interested. Did you glass over the top of the tank?Thanks and congratulations on completing such a huge repair. When you found the deck compression issue, you must have been nigh suicidal. However, as I learned through two survey failures (one on a Newport 30 with wet decks and one on the S2, which required the owner to do some significant repairs), when you buy a 20-30 year old sailboat, it is not a matter of whether or not something is wrong, but whether or not what is wrong is expected and repairable. We doubled the amount of money we spent on a 30 footer from 10K to 20K and the new boat still has some minor moisture issues, needed some bulkhead repairs (leaking chain plates), had (has?) pinholes in the fuel tank, needs repairs to the engine bed tabbing, etc...etc... However, I am firmly convinces she is a good old boat that will take me where we want to go with a little more TLC on my part. And what the heck...a new one is only $100K+ right?Bob