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Phil,

Honestly Michael on the right track. Don McIntyre installed a standard 1" brass thru hull drain on his late 70's 21 Outrage that went through the bulkhead of the fuel tank cavity to the rear bilge. I would have done the same thing had I taken my fuel tank out. When Don had a new tank put back in though he did not foam it in place but built a cradle for it to sit on. This way the water could run around the tank and out the drain.

One thing though Michael, there is no need for you to add a scupper on the bilge side. Honestly water is going to get in there no matter what so, you want it to get out as easy as possible. Also, I have found that those scuppers do not seal well anyways if there is not a large amount of water pushing against it.