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1973 21 Outrage- Internal tank was pulled years ago- switched over to an on-deck external tank- works fine. When we pulled the internal tank (which was full of water and surrounded by saturated foam), we placed rigid foam in the cavity - the type used for floating docks.

Pulled the boat for this season and found the cavity full of water around the foam and some of the foam had degraded. I'm looking for the best option to deal with water in the cavity. I've read so many threads about folks putting the internal tank back in... Has anybody left it empty? I thought of a drain from the cavity to the sump, but the sump is always full of water since I leave the sump plug out. I would think I'd get A LOT of water sitting in the cavity as well as the sump if I installed a drain - and I don't want to count on a scupper keeping water out of the cavity.

Seems like entirely sealing the cavity would be the answer. Has anybody done this or dealt with the cavity - without a tank - in a way that solved the water problem?

Thx,
Jim