Speaking of bilge pumps, my boat started sinking recently - fortunately slowly but the water was almost up to the floorboards.
There are four hose clamps on the rubber tubing where the prop shaft goes through the hull behind the engine. Even though the clamps are SS, one of them had corroded and broken. The occasional drip from the stuffing box/gland was quite a bit more than an occasional drip. So there's something to check.
I have a little round Rule electric pump that just fits between the keel bolts so it bottoms out on the floor of the sump. It has a built-in water sensor (no float switch) and I added a check valve in the hose just above it. It's nice for keeping the bilge really dry.