Another Way . . .
John, I just did this also, in my dinette model. The PO had a manual Whale pump (that has seen better days) in the port cockpit settee. I purchased an Atwood pump, and float switch and mounted them in the forward (lowest) part of the bilge. I first thought about running the hose and wires out the aft end of the bilge and under my A-4 (that I wouldn't trade for any diesel or OB, BTW) but I wasn't sure how much room was there and worried about the hose being pinched or chaffed (I couldn't really see under there, and when I shined a light in one end none of it came out the other. Remember, older boats have all kinds of mods, i.e., like various type pans that sit below the engine and they may restict access from one boat to another). I opted to run the hose and wires out the starboard side of the bilge, between the bilge and the deck liner, and under the starboard settee, passed the fuel tank, behind the engine and out to the thru-hull. (Use plastic tie wraps in all appropriate places, especially around the exhaust system).This is a longer run, but it still empties a full bilge very quickly and I can get to, and inspect any part of the system. Shrink wrap is good, but I prefer liquid electrical tape by Starbrite as I find it more waterproof and easier to apply. Good Luck,Nick "Julia Bell"#86