Bilge pump choices
You don''t want to ďTĒ into the existing pump line of a centrifugal pump. You would be then pumping water right back into the bilge through the unused pump.
A friend of mine has a small 360 GPH pump mounted in the very deepest part if his bilge, on a line reduced to about 3/8-inch copper tubing. This pump is powered through the same float switch as the larger pump. Here''s his secret, he''s run the tubing to discharging just a couple of inches above and into a cockpit drain. Now, as he''s sailing along, he has a visual and audible "high bilge water alarm" of sorts. Running the main pump dry for the short amount of time it takes for the smaller pump to clear the bilge is not a problem for a centrifugal pump.
I think his idea is a great one, but I canít use it on my boat. I keep that last space between the floor timbers filled with seawater as I have a swell-fit bung there. Now, my boat donít leak like some wooden boats do and Iím afraid that if that bung ever dried out and shrunk, I could be in a world of trouble!