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Best way to install a 2nd bilge pump.

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  • Best way to install a 2nd bilge pump.

    After reading an earlier post about bilge pumps I've decided to install a 2nd pump in my boat. I've ordered a 1000gph Rule pump to match the one I already have installed. I plan on mounting it a little higher in the bilge than the one already mounted so it will only come on if the other pump stops working or it will not handle the amount of water coming into the bilge. Do I need to install another water hose outlet or will I be able to Y off the hose already installed? What will be the best way to install this 2nd pump?
    1995 Monterey Montura 196
    4.3 Liter LX (OF578648)
    Alpha 1 Gen II (OF519289) 1.84R

  • #2
    Re: Best way to install a 2nd bilge pump.

    Use a separate discharge thru-hull. With a Y-pipe, you'd have to install check valves between each pump and the Y, adding expense, complication, restriction in the line, and two more potential points of failure. K.I.S.S., as the saying goes. (Keep It Simple, Silly!)
    Bob, Seneca Lake NY
    '88 Bayliner 1700 Capri bowrider, 85 HP Force O/B, "Sea Weasel"
    '94 Grumman Fish'N Fun pontoon, 40 HP Merc
    Want a vessel safety check? Click here. Want to join the Coast Guard Auxiliary? Click here.
    Disclaimer: Although I am a member of the USCG Auxiliary, the opinions and advice in my replies are my own and do not necessarily reflect CG or CG Auxiliary policy or regulations unless so specified.

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    • #3
      Re: Best way to install a 2nd bilge pump.

      It's something that's on my short list of things to do, too.

      I look at it this way- the second pump is your last defense against disaster. i wouldn't share anything with an existing pump- not wiring, not switches, not hoses, not through-hull. I'd install with smooth-bore hose to maximize output, too.
      John and Linda
      Long Island, NY
      Escapade III
      1992 Carver 26 Command Bridge
      Twin Merc Alpha 4.3 'Gen +'

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      • #4
        Re: Best way to install a 2nd bilge pump.

        I got this advise last year from many people here and it was good advise. SEPARATE lines, one on each side of the boat for discharge. I installed the second one above the one in the bottom of the bilge, and put an automatic switch on it. This way no matter what (famous last words) happens, I should be floating. It was a very simple job. Just be sure to use a good grade marine silicone around the fitting for the discharge hose. I also had the outlet way above the waterline, just to be sure.
        The reason I do what I do is in the avatar above.

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        • #5
          Re: Best way to install a 2nd bilge pump.

          It is a matter of physics when it comes to sharing an outlet with another pump. One pump pretty much uses up the capacity of the line attached to that pump. Adding another pump to that line through a "Y" does nothing for you since the two pumps now fight for capacity. Besides, the stronger pump would pump water backward through the other unless check valves were installed.

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          • #6
            Re: Best way to install a 2nd bilge pump.

            i use separate energy sources also, 2 separate batteries, if 1st pump, kills it's battery, the second pump still has power.
            FLORIDA GATORS
            TEBOW Country



            Please, NO PM's (Private Messages) regarding boat/engine problems. they will not be answered.
            That is what these forums are for. Post your questions, in the appropriate Forum.

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            • #7
              Re: Best way to install a 2nd bilge pump.

              What type of smooth bore hose?
              1995 Monterey Montura 196
              4.3 Liter LX (OF578648)
              Alpha 1 Gen II (OF519289) 1.84R

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              • #8
                Re: Best way to install a 2nd bilge pump.

                I use the clear tubing that has the layer of white fiber reinforcement sandwiched in. You can see the water flowing through it. You want something stiff enough that it won't kink easily.

                http://www.***************/webapp/wcs...4&ci_sku=17853
                "It is not death that a man should fear, but he should fear never beginning to live. When you arise in the morning, think of what a precious privilege it is to be alive - to breathe, to think, to enjoy, to love." ~ Marcus Aurelius

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                • #9
                  Re: Best way to install a 2nd bilge pump.

                  Don't install the pump Higher, install the float higher! Wire in a high water alarm as well. All wiring separate.

                  But here's the funny thing. Most boats these days have an indicator light on the bilge pump switch on the dash that illuminates when the float turns on the bilge pump. Now, If I'm just cruising along and I see my bilge switch light come on, well, I'm going to back off and see what the hell is going on in my bilge. Therefore, even though I applaud the install of a high water alarm, well, at that point when it goes off, shouldn't action have already been taken? So therefore, is it really an alarm?

                  If a boater doesn't check his bilge every 15 minutes or so, he/she is asking for it...

                  Just my $.02

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                  • #10
                    Re: Best way to install a 2nd bilge pump.

                    hard to check if you are sleeping or not on the boat..... I will have an alarm for sure
                    Kevin

                    Originally posted by Tinnie
                    But, where are the reevets?
                    1981 Wellcraft V-20 CC Fisherman (FREE BOAT)
                    1989 Wellcraft Monte Carlo 28(Build thread here)
                    1992 Hotsports Jet'n'Cat Yam 701 WR3 drivetrain "SS George Washington"
                    90's Yamaha WRIII and a pair of 95 Kawasaki ZXI-900's
                    Fresh clean cheap oil is better then old dirty expensive oil any day
                    sigpic

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                    • #11
                      Re: Best way to install a 2nd bilge pump.

                      I have some fairly old boats, but I don't "check the bilge" every 15 minutes. Otherwise the advice here is solid.

                      Depending on your hull (bilge) design you might put the second pump further forward in case water settles there instead of in the stern.
                      A man of constant boat tinkering.

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                      • #12
                        Re: Best way to install a 2nd bilge pump.

                        For anyone who is interested in the subject:

                        http://www.yachtsurvey.com/bilge_pumps.htm
                        Southern, NJ, USA

                        Currently Boatless
                        Date an I/O, but marry an outboard!

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                        • #13
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                          Re: Best way to install a 2nd bilge pump.

                          From looking at my boat it will be easier to install both pump line outlets on the port side beside each other. On the starboard side the fuel fill hose takes up the space where I would need to install the hose outlet.
                          1995 Monterey Montura 196
                          4.3 Liter LX (OF578648)
                          Alpha 1 Gen II (OF519289) 1.84R

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