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What's in your fresh water tank???? What's the best way to fix this?

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    What's in your fresh water tank???? What's the best way to fix this?

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ID:	399800 I am putting in a new teak wood floor in my Avanti 3450 and realized once I do that I can no longer work on the fresh water tank because it's under the cabin floor all sealed off.

    I decided I needed to inspect it so I put a bore scope in it and this is what I found.


    one of the areas looks like a possible leak. Pretty disgusting though. The black hose is the fresh water tank vent hose. It's supposed to be clear. You can also see the cork on the tank sender is pretty much rotten.

    Any ideas on what's the best way to repair this? It's a 50 gallon tank. Aluminum. I guess I coukd have a new aluminum tank made. Probably cost about $700 to$1000.

    I'm kind cleaning toward a bladder tank as there is one that will fit the space.

    should I seal the floor back up or make it so I can access it.


    1989 Avanti 3450 Sunbridge
    twin 454's
    MV Mar-Y-Sol
    1979 Bayliner Conquest 3150 hardtop ocean express.
    Twin chevy 350's inboard
    Ben- Jamin
    spokane Washington

    #2
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ID:	399804 This is the sending unit and the floor where the tank is below. The measuring tape represents about where the tank ends.

    the pic of the wood floor is maybe what I could do to create access to the tank. Maybe I'm over thinking it. Maybe I shoukd just replace the tank and seal it up.

    a 55 gallon bladder I can get for about $120 a plastic tank in the $500 range and an aluminum probably around $700+

    what do you think will be the best way to repair this?
    1989 Avanti 3450 Sunbridge
    twin 454's
    MV Mar-Y-Sol
    1979 Bayliner Conquest 3150 hardtop ocean express.
    Twin chevy 350's inboard
    Ben- Jamin
    spokane Washington

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      #3
      I would go with a plastic tank. However remember that hoses, water level sending unit ,etc do not last forever. For those reasons I would do the extra work to make it accessible.
      The example floor looks fantastic and has access.
      Gibraltar, Mi.
      1986- 3870- Hino 175's - Just purchased May ,2017
      34' Tollycraft- sold
      88 26' Shamrock/ Diesel
      14' Zodiac Bay Runner

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        #4
        Originally posted by Sunbird View Post
        I would go with a plastic tank. However remember that hoses, water level sending unit ,etc do not last forever. For those reasons I would do the extra work to make it accessible.
        The example floor looks fantastic and has access.
        Ditto.
        Jeff & Tara
        (And Ginger too)
        Lake Havasu City, AZ

        2000 Bayliner 3388
        "GetAway"
        Cummins 4bta 250s

        In memory of Shadow, the best boat dog ever. Rest in peace, girl. July 2, 2010

        Comment


          #5
          Plastic tanks, I will be building 2 fiberglass tanks to replace my tank on my 3870, there were more holes on the top of the tank than the bottom.
          Aluminum water tanks are no longer allowed on new boats.
          Pat says: DO-IT-RIGHT THE FIRST TIME!

          Bayliner 3870 "ALASKA33)
          Twin 350 GM power
          Located in Seward, AK
          Retired marine surveyor

          Comment


            #6
            Originally posted by boatworkfl View Post
            Plastic tanks, I will be building 2 fiberglass tanks to replace my tank on my 3870, there were more holes on the top of the tank than the bottom.
            Aluminum water tanks are no longer allowed on new boats.
            My searay had a plastic tank and I used to drink the water from that system. My bayliners have all had aluminum tanks. No way do I drink that water. I bring lots of bottled water for that. After seeing the inside of this tank even less now would I drink from an aluminum tank.
            1989 Avanti 3450 Sunbridge
            twin 454's
            MV Mar-Y-Sol
            1979 Bayliner Conquest 3150 hardtop ocean express.
            Twin chevy 350's inboard
            Ben- Jamin
            spokane Washington

            Comment


              #7
              I vote cut out that discussing tank and replace with plastic or a bladder and definitely create an access hatch for future tinkering.
              Dave
              Edmonds, WA
              "THE FIX"
              '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
              (.030 over-Vortec top end-part closed cooled)
              The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
              Misc. projects thread
              https://www.baylinerownersclub.org/f...56-gctid789773

              Comment


                #8
                I would like to replace it with a plastic tank however there aren't a lot of options size wise that will fit. I did find one that we 75 gallons a 25 gallon upgrade if i have length space. It seems to have a odd highth to width measurment. Too tall too wide or narrow and so on.

                the bladder fits the space and is 5 gallons more. I'm going to try and cut it out later today and see what's going on.
                1989 Avanti 3450 Sunbridge
                twin 454's
                MV Mar-Y-Sol
                1979 Bayliner Conquest 3150 hardtop ocean express.
                Twin chevy 350's inboard
                Ben- Jamin
                spokane Washington

                Comment


                  #9
                  If buying a bladder be sure it has baffles.
                  Pat says: DO-IT-RIGHT THE FIRST TIME!

                  Bayliner 3870 "ALASKA33)
                  Twin 350 GM power
                  Located in Seward, AK
                  Retired marine surveyor

                  Comment


                    #10
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ID:	399900 I guess it's later today already. . Here is the offending tank. 72×27×6 tag says 51 gallons I think I might even be able to go 3 inches deeper. I guess at least I'll have access to it now. Too bad it's all tabbed in. Probably impossible to get out without damaging it if that even matters at this point.

                    I'm actually glad I cut the floor out. The top of the tank was disguting full mouse crap and dog hair piles of dog hair..
                    1989 Avanti 3450 Sunbridge
                    twin 454's
                    MV Mar-Y-Sol
                    1979 Bayliner Conquest 3150 hardtop ocean express.
                    Twin chevy 350's inboard
                    Ben- Jamin
                    spokane Washington

                    Comment


                      #11
                      I feel like there was a thread on here that mentioned a company that would make a plastic tank to whatever dimensions needed for what seemed like a decent price. I also recall a thread where someone replaced their aluminum tank with two smaller plastic ones and connected them at one of the lower corners. Too bad the pics didn't come through the site upgrade which seems like a customer support issue. But I digress.

                      Paul
                      US Army (Retired), Federal Way, WA

                      1990 Bayliner 3288 - the "Janna Lea"
                      MMSI: 338181912

                      Comment


                        #12
                        I have a 200 litre bladder and it works fine. You won't require a vent line but you can't connect a sender either. You'll need easy access to check the water level.
                        "Martini's Law"
                        1986 Bayliner 3270, 110 Hino's
                        Nova Scotia, Canada

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                          #13
                          Originally posted by boatworkfl View Post
                          If buying a bladder be sure it has baffles.
                          Once it has water in it, it doesn't move. The flexible bladder absorbs the motion of the water inside.
                          "Martini's Law"
                          1986 Bayliner 3270, 110 Hino's
                          Nova Scotia, Canada

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                            #14
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ID:	400055 I've thought about the no gauge thing on a bladder. This is what I've been thinking a in line water meter it can be reset when you fill so you know how much you have used providing you remember to reset at refill. It only costs about 25-30$
                            1989 Avanti 3450 Sunbridge
                            twin 454's
                            MV Mar-Y-Sol
                            1979 Bayliner Conquest 3150 hardtop ocean express.
                            Twin chevy 350's inboard
                            Ben- Jamin
                            spokane Washington

                            Comment


                              #15
                              Originally posted by yachtman View Post
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ID:	400055 I've thought about the no gauge thing on a bladder. This is what I've been thinking a in line water meter it can be reset when you fill so you know how much you have used providing you remember to reset at refill. It only costs about 25-30$
                              Perfect! I was looking for a solution to that problem. I ended up cutting an access hatch to check the water level.
                              "Martini's Law"
                              1986 Bayliner 3270, 110 Hino's
                              Nova Scotia, Canada

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