Donald, many would argue that a one-way valve is not a good idea in a bilge pump. I can’t speak from my own experience, but many (wise) people talk about the one-way valves clogging and severely restricting the flow.
If you want to prevent the water flowing back from the big pump, you can use the small pump for that (i.e. you let the water to flow back, but remove it with a smaller pump (smaller hose, smaller amount of water there, lower in the bilge). Marek C270 “Legato” Ottawa, ON From: Donald Sebastian via CnC-List Sent: Friday, May 13, 2016 11:00 To: cnc-list@cnc-list.com Cc: Donald Sebastian Subject: Re: Stus-List Through hole location for bilge outputs Gene, I was actually going to do the same thing on my boat. Just recently purchased a boat and had a bilge pump but was not automatic. I actually hooked the current smaller pump that fits into the small well and did install a float valve but had to attached it slightly higher that the pump just because it wouldn’t fit tin the small well. I am going to add a second pump and sensor and looking at the option below. The plan is to attach a smaller electronic bilge pump switch that i can epoxy to the side of the small well. Then add a larger external pump that will have a hose running to that well. This hose will have a one way valve in that well to prevent the water from flowing back into the well and keep the pump from cycling on and off with flow back. Then I plan to put a y connector to the current hose near the exit point of the boat. I do plan to put 2 one way valve on each hose at this point to keep water form being pumped back into the other pump hose and assume flow to the outside. The sensor and pump are here: http://www.iboats.com/Johnson-Pumps-Ultima-Bilge-Switch/dm/cart_id.141200884--session_id.712849042--view_id.49248 http://www.pbsboatstore.com/Jabsco-31705-0092.htm Donald On May 12, 2016, at 1:14 PM, Eugene Fodor via CnC-List <cnc-list@cnc-list.com> wrote: Hi Folks, I just purchased a C&C 29 Mark II, Hawk, and I'm looking for advise on upgrading the bilge pump situation. There is no auto pump in the boat which scares the hell out of me, so that's the first improvement in order. I'm following Don Casey's advise on putting in a small automatic bilge pump at the very bottom and then I plan to put in a larger one above it for when I really need to move water (which hopefully never happens). So here's my question: Question 1: Where to put the through hole for the output? I'm thinking about halfway between the midship and stern and just below the deck hull joint. That way if the rail is buried it still won't siphon. This hole/hose will be 1/2 inch. Question 2: For the larger pump, I'm wondering if it would be acceptable to put in a Y connector shared with the manual bilde pump to avoid putting another hole in the hull. I would put the connector right above the throughhole assuming it fits so that gravity would ensure that they don't pump back into the other hose. This hole/hose will be over 1". The current one goes out above the water line in the stern. Thanks, Gene Fodor "Hawk", 29 mark II _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
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