Have you contacted Sea Hunt about this issue? They might be able to give you some suggestions. The vertical placement seems to be contributing to your problem, and I wonder what size your drain hoses are? I have two boats with floor drains and they drain freely. Do you have access to your drain lines? I would write to Sea Hunt @ 2348 Shop Road, Columbia, S.C. 29201 or call them @803.755.6539 and get their input on the problem. If they can't help, then I'd start thinking about alternate solutions. Additionally, Is it possible that you have some debris clogging the drain hoses? I would flush each line out with a garden hose held right up against the drain and see if you clear any debris out. I do it a couple of times a season because of leaves or other small debris that find their way past the scuppers.
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