I discovered that the galley sink drain line drains to the port cockpit scupper, and the sump pump drains into the aft starboard deck scupper. Anyone else find this situation on their boat. I don't think this is such a great design! Solutions???
The galley drain you describe is what my boat and what I think most others have. The cockpit drain seacock can be closed. I'll let the more experience 365 sailors comment on how well this system works.
I have 2 bilge pumps and one float switch. The high volume Rule centrifugal pump has its own 1 1/4" thru-hull inside the port sail locker. This hose has an anti siphon loop up under the gunwhale, an important thing I'm not sure your cockpit drain connection has. Without this loop, heeled over your centrifugal pump will allow seawater to drain into the bilge. When the pump comes on it might pump bilgewater up on deck. Hence the need for a dedicated thruhull.
My secondary pump is a Whale gulper below the sole that runs through 3/4" hose to the stern. I have a programmable time delay relay that lets this pump run an extra 30 seconds after the float switch goes low. This does a nice job of emtying the bilge completely. I plan to also use this pump to empty the TBD shower bilge tank via 3/4" Y valve. A simple pushbutton from the head will engage the time delay cycle.
Pete W.