Cutting a through-hull for bilge pump outlet - Page 2 - SailNet Community
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post #11 of 17 Old 04-20-2013
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When I replaced my bilge pump through hull a while back, I used 3M 4000 Marine sealant. It resists UV degradation better than 4200 does and is about as strong. I second using a hose loop as high as your waterline when heeled is likely to be. I had the backflow problem too until I finally figured out where the water was coming from.

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post #12 of 17 Old 04-20-2013
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Re: Cutting a through-hull for bilge pump outlet

my boat uses a manual pump.. which is good as there are no other through hulls (except for an above waterline sink) but I was debating putting an electric pump in as a "just in case" for storms and times when I may be out of state working.

it's a 24foot Sea Sprite and I was thinking of running the hose aft to the outboard engine well. Do you think a pump can push that much water? (approximatly 10 feet)

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post #13 of 17 Old 04-20-2013
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Re: Cutting a through-hull for bilge pump outlet

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it's a 24foot Sea Sprite and I was thinking of running the hose aft to the outboard engine well. Do you think a pump can push that much water? (approximatly 10 feet)
Both my electric bilge pumps push water around 19 or 20 feet of hose run from the bilge to the transom, is that what you mean? I think it's pretty common. I'd not be without at least one electric bilge pump wired straight to the battery (with a fuse). Cheap peace of mind when away from your boat.

I am not sure about outletting into the engine well. Is there anything stopping you from going to the transom or thereabouts? The engine well may be fine, I don't have any idea what yours is like/how it drains, etc.

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post #14 of 17 Old 04-20-2013
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Re: Cutting a through-hull for bilge pump outlet

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The engine well may be fine, I don't have any idea what yours is like/how it drains, etc.
it's a big open hole in the hull, Being as it is about 2 feet deep, that would be two feet less hose between the pump and outside as opposed to going all the way to the transom

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post #15 of 17 Old 04-21-2013
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Re: Cutting a through-hull for bilge pump outlet

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it's a big open hole in the hull, Being as it is about 2 feet deep, that would be two feet less hose between the pump and outside as opposed to going all the way to the transom
Folks usually plumb the bilge pump to the transom because it's almost impossible for the transom to be underwater (unless the boat is far beyond any help a little bilge pump might provide). As long as the engine well never gets enough water to potentially start a back siphon via the bilge pump hose, and you don't mind your outboard getting sprayed with bilge water, it should be fine.

However, one added advantage of going to the transom is that if the pump starts to continuously spew water out (i.e., you have a serious leak and the pump is always on) someone might notice and get word to your marina and/or you before your boat sinks. Such an event happened on my dock almost a year ago; another dock neighbor noticed a bilge pump running almost continuously, he pointed it out to the marina manager, who called the boat's owner, and disaster was avoided (I heard that it was a faulty knotmeter sender).

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post #16 of 17 Old 04-21-2013
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Re: Cutting a through-hull for bilge pump outlet

I dont think that 2 more feet of smooth bored hose traveling laterally is going to make much difference in pumping. Corrugated hose might. It's rise that makes the most difference and you should already have an anti-siphon loop that is higher than the outlet.


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post #17 of 17 Old 04-21-2013
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Re: Cutting a through-hull for bilge pump outlet

that's just it. I have a manual pump that requires me to put a hose over the side before pumping. So I am trying to decide the best course of action for a little piece of mind. I wanted to go to the stern to keep heel from affecting the flow.. so maybe I will go to one side of the engine well rather than right to it

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