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Noisy fresh water pump and water lines

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    Noisy fresh water pump and water lines

    The fresh water pump, (Flojet 4405-143) , on my 3988 was really noisy and the vibration from the pump was rattling the hard plastic water lines. I initially thought about securing the water lines and going to a variable flow pump; however, after doing a little research, (this forum), I ended up installing a flexible water line loop on the supply side of the pump, (see picture). This flexible loop absorbs the vibration from the pump so it's not transferred to the lines. It's dramatic how this solution quieted everything down, including the pump itself. I understand that installing an accumulator will also perform this function.
    Alex
    Orange County, Ca.
    2001 3988
    Twin Cummins 330's

    #2
    Good to know. Any size accumulator would really cut down on pump cycling.
    2007 Discovery 246
    300mpi BIII
    Welcome island Lake Superior

    Comment


      #3
      I think you meant the demand side.
      Jeff & Tara (And Ginger too)
      Lake Havasu City, AZ
      |
      Current: 2008 Playcraft 2400 MCM 350 Mag B3
      2000 Bayliner 3388 Cummins 4bta 250s (SOLD 2020)
      2000 Bayliner 2858 MCM 7.4 MPI B3 (SOLD 2018)
      2007 Bayliner 305 MCM twin 350 Mag B3s (SOLD 2012)
      2008 Bayliner 289 MCM 350 Mag Sea Core B3 (SOLD 2009)
      And 12 others...
      In memory of Shadow, the best boat dog ever. Rest in peace, girl. 7-2-10

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      • Ahaua
        Ahaua commented
        Editing a comment
        You are correct.....the demand side. Thanks for catching that.

      #4
      Alex, great job buddy! Watch that reinforced hose though, it’s famous for collapsing and kinking under its own weight. The top of the loop may need to be supported. Time will tell.
      Jim Gandee
      1989 3888
      Hino 175's
      Fire Escape
      [email protected]
      Alamitos Bay, SoCal

      Comment


      • Ahaua
        Ahaua commented
        Editing a comment
        Thanks for the advice Jimbo. I'm thinking about switching over to an accumulator tank in the near future; why didn't you tell me sooner!?.....lol

      #5
      I have my pump bolted to a thick piece of rubber that is mounted to the bulkhead. I also have a 2 gallon accumulator tank.
      The tank cuts out a lot of the pump cycling on and off every time you turn on the water.
      1999 Bayliner Ciera 2655
      5.7 Bravo 3

      Comment


      • Ahaua
        Ahaua commented
        Editing a comment
        I'm thinking that eventually I'll rig up a similar system. From what I'm hearing, it's definitely the better way to go. Thanks!

      #6
      That is exactly what I did with my pump to reduce noise but the pictures are long gone with the changeover. Instead of an accumulator tank I went with the variable speed pump. The results are amazing because it eliminates the need for an accumulator tank and it eliminates the annoying temperature changes in the shower.
      "Adios Dinero"
      1997 3988 with new 330 Cummins
      Photo Credit: Whiskywizard

      Comment


      • Ahaua
        Ahaua commented
        Editing a comment
        I was considering doing the same, (one of my dock buddies with the same boat did this),; however, after reading about variable flow pumps, it sounded like quite a few people were not happy with them....sounds like it's working for you. Thanks for the comment!

      #7
      I have the same pump in my 3988, it was also really noisy when I bought the boat.
      I just replaced it with a new one (same type), and that fixed the problem.....nice and quite now.
      Greg
      1999 Bayliner 3988
      Twin Cummins 6BTA 270hp
      Malaspina Strait, BC

      Comment


      • Ahaua
        Ahaua commented
        Editing a comment
        Thanks Greg. I do have a brand new pump as a backup. The flexible hose loop really helped but I'll keep this in mind if it starts getting noisy again. In addition, I'm really considering adding an accumulator. Thanks again.

      #8
      Greg
      1999 Bayliner 3988
      Twin Cummins 6BTA 270hp
      Malaspina Strait, BC

      Comment


        #9
        Question for The Other Gary, what model variable speed pump did you use?
        2000 4788 w Cummins 370's, underhulls, swim step hull extension
        12' Rendova center console with 40HP Yamaha
        MV Kia Orana
        Currently Enjoying the PNW

        Comment


          #10
          My boat's pump is fairly quiet, but this is not the case with my travel trailer. I used two loops of hose on my trailer's pump (demand and supply) to isolate it completely. Moreover, I added additional clamps to the first couple of feet of the rigid tubing. This made a huge difference in noise.
          1999 3788, Cummins 270 "Freedom"
          2013 Boston Whaler 130 SS
          Anacortes, WA
          Isla Verde, PR

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