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The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
In round 14 of cleaning up, I was scrubbing the insides of the under-settee lockers. When I rinsed, the water just collected there instead of draining into the bilge. I looked around but did not see any drain holes (port side has diesel tank and starboard has water tank, so it is not easy to see). I had to sacrifice a towel to get the water out the hard way. Why don't these spaces drain into the bilge? Any window leak would collect there instead of ending up in the bilge.
You say diesel, so I assume your C25 is one of the rare ones that has an inboard diesel. On my C25 the port side tank is the holding tank, and water can gather aft of that. Once it reaches a certain level, it overflows back into the bilge. The starboard side has a liner that is part of the main cabin liner, so any water collecting there stays. The C25 is a dry boat in general, but every boat has its quirks, and there are certainly places other than the bilge where water can gather in most sailboats (most alarmingly between the gelcoat and the fiberglass on the hull exterior below the waterline. But that is another story...
Is it possible that this area intentionally does not drain to the bilge to contain fuel leaks/fumes from your inboard engine and mitigate possible explosive situations?
My older C25 (82 I think) did not have a separate fuel locker from the rest of the lazerette so I occasionally get some gas smell in the cabin. I understand later models made the gas locker separate for this reason.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.