I put in a bilge pump on our S before leaving on the last trip, but see 2 problems with what I did.
On the S and D the ballast tank is in the middle and rises higher than the bilge areas under the seats on both sides of the cabin. Right now I have one pump on the port side and it can pump up and out a thru-hull fitting up on the side of the boat above the rub rail. I have pictures of the installation, but not on our site yet.
I have the pump wired to a switch by the seat. If we started to take on water we could turn it on. The boat isn't slipped, so when it is in the water we are on it over 90% of the time.
Now for the problem. If we say holed the boat on the port side that would probably be ok as we could turn on the pump. Now lets say we holed the boat on the starboard side. The water would come in, but not flow right away to the port side since the ballast tank would prevent that. So the boat would probably start to list more and more to starboard and the water might never rise enough for the pump on the port side to do anything.
I had bought 2 pumps, but ran out of time to put the second one in on the starboard side. The boat is in Florida and we are going back to Utah. When we return to the boat in the spring I'm taking the other pump and installing it.
Now the second problem and that involves turning the pump on and off manually. I thought this would probably work, but lets say you are taking on water. You are probably going to be pretty occupied with stopping it from coming in and/or getting the boat to shallow water. Turning the pump on is no problem, but what happens if it can pump the water out faster than it is coming in. The pump will go dry and maybe burn up and that wouldn't be good. You are busy and won't have time to go down and turn the pump on and off.
I'm going to install also when we go back two low water switches that will turn the pumps (2 switches, one for each pump) on and off anytime the water is above the pickup on the pump. Now even if we are off the boat we can turn the pumps on, but they won't come on unless the boat is taking on water.
For you maybe just one pump in the lowest part of the boat or close to it will work since you don't have the ballast tank. Now if the keel trunk divides the bilge in 2 then maybe you will have the same decision to make. Either way I would also install the auto switch so you don't have to turn the pump on and off. Still install a manual switch in the circuit so that you could override the other switch. I'd use a single pole double throw with a center off. That way you could turn it off or to on or to on only if the sensor switch also goes on.
Good luck and at some point I will post pictures of what I did,
Sum
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