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This was done by the previous owner, they installed a 12 gallon tank and changed the fuel fill to the deck instead of the transom, would have preferred the transom but it works.

I ended up sealing up the drain tribe from ski locker to fuel cavity ( dont get why BW drained the ski locker to the fuel cavity). Sealed the gap from rigging trough to fuel cavity (another head scratcher), I had a extremely dense squishy foam block that I had lying around, cut to fit around the fuel vent hose and caulked it. Replaced the deck plates and sealed them,. I think the fuel cavity will remain dry but I can remove the deck plate and pump out if needed, the deck plate is right above the void behind fuel tank.