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Old 08-19-2009, 06:54 PM   #1
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Default Questions about installing a second bilge pump

I've been wanting to install a second bilge pump and i was wondering how yall have done it. Do you Y both bilge hoses to the 1 thru hull exit? or do you drill and make a new exit? thanks
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Old 08-19-2009, 06:55 PM   #2
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Default RE: Questions about installing a second bilge pump

there are 2 exits on my boat. one pump is mounted slightly higher than the other so they don't compete with each other.
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Old 08-19-2009, 07:04 PM   #3
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Default RE: Questions about installing a second bilge pump

I suppose you could put one way check valves just down line of each bilge pump and use a t-fitting to your single thru hull(you'd need a check valve for each pump or the waste water pumping from one would pour back into the bilge through the second pump).

For a true back-up and separate system use a second through hull. It's not tough to do. I recommend a metal thru hull fitting rather than the plastic. depending on how tight your hose is it can apply side pressure to the thru hull fitting and eventually break a plastic one.

A second thru hull is preferred for sure though.

Good Luck,

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Old 08-19-2009, 07:56 PM   #4
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Default RE: Questions about installing a second bilge pump

not to disagree with your knowledge but i hear that you're not suppose to put valves in the hose because it slows down the flow a lot.
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Old 08-19-2009, 08:11 PM   #5
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Default RE: Questions about installing a second bilge pump

Quote:
FO' REEL (8/19/2009)not to disagree with your knowledge but i hear that you're not suppose to put valves in the hose because it slows down the flow a lot.
Sounds good to me... I wouldn't put them in, I ran aseparate thru hull for each of my 3 bilge pumps. I think you gave agood reason to do the extra thru hull.:letsdrink:letsdrink:letsdrink

If you put two pumps on the same hose a lot of the water would simplybackflow to the bilge when one pump runsand the other does not. That's why check valves would be necessary if you wanted to use a single thru hull.

Jim
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Old 08-19-2009, 08:38 PM   #6
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Default RE: Questions about installing a second bilge pump

ABYC Standard for pumps/discharge is 1 discharge for 1 pump. No doubling up. Can run them electrically together for simultaneous operation.

Hope this helps.
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Old 08-20-2009, 06:56 AM   #7
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Default RE: Questions about installing a second bilge pump

Hi Tom, welcome aboard, glad to have another professional with good advice on the forum,,,,
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Old 08-20-2009, 11:53 AM   #8
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Default RE: Questions about installing a second bilge pump

Thanks Kenny!!! You still the best!
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Old 08-20-2009, 01:00 PM   #9
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Default RE: Questions about installing a second bilge pump

so i can tap into the existing wires for the new pump? or will i have to run separate wires for both? how hard to make a new bilge exit hole? im sure i can just drill a fit the new thru hull fitting and throw some sealant around it, run the hose, and wire the pump/float and i should be good right?
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Old 08-20-2009, 01:12 PM   #10
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Default RE: Questions about installing a second bilge pump

My boat came with (1) one bilge pump..didn't take me long to add another (automatic) and a separate discharge. I had it easy on the instillation of the discharge. Some boats will be tougher. I would NEVER think of running two on one discharge, even with a check valve. FYI if a check valve is ever needed, a washing machine/dish washercheck valve makes for a great one...they are made of nylon and has a free floating ball in them and you can get them free. I used one on my bait well instillation as I have a bilge pump mounted on the outside of the transom for fresh water, to help out with the head lift.
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