Just another Moderator
Join Date: Sep 2005
Location: New Westminster, BC
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Yeah, but if a beer can leaks you'd have beer in the bilge..
The water level in your sink drain will, of course, be at the waterline level. If the bottom of your sink is close to waterline, then the sink will barely drain, ie water in the drain line will always be there. - If your sink actually won't drain at all, then it's either too low in the boat (or too deep for that location) or the drain line is plugged somewhere.
Also if the sink is a ways off centerline then you're probably going to get water back into the sink when heeled towards that side. On many boats one of the pre-sailing routines is to close such sink through hulls (galley and/or head) to avoid a wet surprise the first time you tack.
Adding a tank/pump sounds unnecessarily complicated.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)