On my 1975 E27, there is a manual bilge pump built into the starboard berth.
What puzzles me is that it pumps the water to a thru-hull that is below the water line.
Seems really odd doesn't it?
I've yet to have this boat in the water, and I'm not sure if I should trust this as a backup to the electric pump.
-Marcus
My take on it is that I would want the bilge pump exit well above the static waterline, and really prefer it above the heeled WL.
Note that these exits are, on most boats, going to be on the transom or high on the stern quarter, just below the rail.
Back siphoning is one reason to keep the exit well above the WL. Also you need to be able to see the pumped water exiting the thruhull fitting, IMO.
"Moving a hole" in your hull involves a bit of glass work, but not very hi tech, and if you read over the little DIY manual from West System Epoxies, it should be straightforward.
Location: by the 80's, Ericson was installing an ORC-approved manual bilge pump that is useable from the normal helm position -- a very desireable concept, IMO.
This pumping system probably added several hundred $ to the cost of each Ericson, compared to a cheapo mass production boat of the same length, it is worth noting.
Early 70's-era boats may not have this as standard, or the prior owner put in a less-well-thought-out manual pump.
Best,
Loren
ps: if the existing bilge hose is over 20 years old or even looks questionable, just replace it. Good Insurance!