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    So I think my freshwater vent line is plugged?-gctid808334

    Been having odd issues with my freshwater system... pump not shutting off automatically, weird fizziness at the tap... all in all, something not right. However, every time I remove the freshwater fill cap, I get a big vacuum suck of air in and everything is ok for a bit. When I close it all up again, run some taps... put my ear to the vent.... NADA. And today, filling.... every so often i get a volcano eruption from the fill pipe! Big old air bubble trapped that comes back out when it SHOULD be venting! So... how to fix it? Compressed air blast from the vent exit on the hull? Anyone experienced this?
    Tyson, Ackerley, Sidney & Gene
    Tsawwassen, BC
    1996 2858 Ciera Command Bridge
    Mercruiser 7.4L BRAVO II (GEN. V) GM 454 V-8; Engine Serial 0F603347
    "Island Passport"
    Home marina: Point Roberts, WA

    #2
    Have the same trouble on a 3270 except that the vent shoots out water when filling the tank and it just hits full. Then little if any venting when drawing from the tank. Vent fitting is clear. Can blow air through the hose. ??? Maybe the hose needs to be replaced. Another project.

    Greg
    Newport, Oregon
    South Beach Marina
    1986 3270 with twin 110 HP Hino diesels. Name of boat "Mr. Darcy"
    Past work history: Prototyping, tooling, and repair for Reinell,. General fiberglass boat repair starting in 1976.
    Also worked as heavy equipment mechanic, and machinery mechanic for over 30 years.

    Comment


      #3
      Cooper, it does sound like your vent is blocked. Could be at the hull fitting, could also be a kinked vent hose.
      Dave
      Edmonds, WA
      "THE FIX"
      '93 2556
      Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

      The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
      Misc. projects thread
      https://www.baylinerownersclub.org/f...56-gctid789773

      Comment


        #4
        Darcy, probably normal for the vent to spill water when the tank becomes full, your fill fitting is likely higher than the vent fitting.
        Dave
        Edmonds, WA
        "THE FIX"
        '93 2556
        Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

        The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
        Misc. projects thread
        https://www.baylinerownersclub.org/f...56-gctid789773

        Comment


          #5
          Yup what Dave said ...all normal
          Joon, Kathy, Jaden & Tristan
          Uniflite 42 AC, DD 671N
          93 3058 sold
          92 2855 (day boat)
          91 Fourwinns 205 (lake boat)
          Longbranch WA
          Life is Good

          Comment


            #6
            put your garden hose to the vent and flush it out.

            Doug
            Started boating 1955
            Number of boats owned 32
            Bayliners
            2655
            2755
            2850
            3870 presently owned
            Favorite boat. Toss up. 46' Chris Craft, 3870 Bayliner

            Comment


              #7
              Hey guys, I realize it is normal to burp water when filling the tank. My concern is that the water flows out, the fitting is clear, I can blow air through the hose, but it won't vent when pumping water. Is it possible the hose is deteriorated inside and causing a venting problem?

              Greg
              Newport, Oregon
              South Beach Marina
              1986 3270 with twin 110 HP Hino diesels. Name of boat "Mr. Darcy"
              Past work history: Prototyping, tooling, and repair for Reinell,. General fiberglass boat repair starting in 1976.
              Also worked as heavy equipment mechanic, and machinery mechanic for over 30 years.

              Comment


                #8
                "Mr. Darcy" post=808468 wrote:
                Hey guys, I realize it is normal to burp water when filling the tank. My concern is that the water flows out, the fitting is clear, I can blow air through the hose, but it won't vent when pumping water. Is it possible the hose is deteriorated inside and causing a venting problem?

                Greg
                If you are getting any kind of burping then the vent is not working correctly. After so many years, you may want to look into replacing the vent hose as they do get quite nasty with mold and mildew. Probably got brittle and kinked. I have always put the hose directly into the filler port and opened the tap full bore, no burping or bubbling just water entering the tank. Eventually it comes out the vent but usually around the same time it overflows from the filler port.
                Cheers, Hans
                2007 Carver 41 CMY
                Twin Volvo D6-370
                Montreal, Canada
                Midnight Sun I Photos

                Comment


                  #9
                  The vents themselves can become plugged. I know my hoses are clear because I just replaced them. I semi unplugged the vents but I am going to replace them eventually. I've been around tanks and pumps pretty much my whole career. If you have any air in the system it will continue to make the pump run. Air compresses, water will not. As someone suggested on another post open the filler cap and see if your pump primes and shuts off.
                  Dan
                  Frostbite Falls, Minnesota
                  Claudia V. III
                  1988 - 3218
                  Gas Drives

                  Comment


                    #10
                    "tdcooper99" post=808334 wrote:
                    Been having odd issues with my freshwater system... pump not shutting off automatically, weird fizziness at the tap... all in all, something not right. However, every time I remove the freshwater fill cap, I get a big vacuum suck of air in and everything is ok for a bit. When I close it all up again, run some taps... put my ear to the vent.... NADA. And today, filling.... every so often i get a volcano eruption from the fill pipe! Big old air bubble trapped that comes back out when it SHOULD be venting! So... how to fix it? Compressed air blast from the vent exit on the hull? Anyone experienced this?
                    If you don't already have one, you should change the vent to a stainless screened vent. Much better. Next, it sounds like you may have leaks in the system. It should be turn on the water and once off, the pump comes to pressure and stops and it should hold that pressure. Spewing and short pump runs indicates a leak in addition to blockage.

                    If you decide to replace the vent, you can punch out the screens on the old one and see if that relieves some pressure, but you MUST replace the screens. Why? Because if a "skeeter" gets in that tank and drops some eggs, you can get really sick from that water.
                    David
                    http://www.cambridgeadvertising.org
                    http://www.davidladewig.com

                    Comment


                      #11
                      Thanks, all good advice. I'll look at replacing the vent line and vent outlet. I do know there is some nastiness in that tank... my filter screen was getting clogged up with green crap when I flushed out the winterising antifreeze a couple weeks back. I'm in the process of sanitising at the moment. I've got a bleach solution in there (concentrations as recommended in my Shurflo pump documentation). Need to flush the bleach out next time I'm down and hopefully it's not too much work to pull a new vent hose through.
                      Tyson, Ackerley, Sidney & Gene
                      Tsawwassen, BC
                      1996 2858 Ciera Command Bridge
                      Mercruiser 7.4L BRAVO II (GEN. V) GM 454 V-8; Engine Serial 0F603347
                      "Island Passport"
                      Home marina: Point Roberts, WA

                      Comment


                        #12
                        Mine had a loop in the vent hose. The low spot on the loop would fill with water & plug it. I had to shorten the hose. It should have a spot higher than the vent but not a loop.
                        Ernie
                        1986 3270
                        Volvo 305s


                        MMSI 338130047
                        Lake Michigan

                        Comment


                          #13
                          "CaptUgly" post=808589 wrote:
                          Mine had a loop in the vent hose. The low spot on the loop would fill with water & plug it. I had to shorten the hose. It should have a spot higher than the vent but not a loop.
                          The loop has a purpose. It keep spray and such out of the tank and should be mounted high enough where the spray goes in and up and then right back out. Most people put the loop in backwards or upside down so it holds water.
                          David
                          http://www.cambridgeadvertising.org
                          http://www.davidladewig.com

                          Comment


                            #14
                            "Four Pyrates" post=808608 wrote:
                            "CaptUgly" post=808589 wrote:
                            Mine had a loop in the vent hose. The low spot on the loop would fill with water & plug it. I had to shorten the hose. It should have a spot higher than the vent but not a loop.
                            The loop has a purpose. It keep spray and such out of the tank and should be mounted high enough where the spray goes in and up and then right back out. Most people put the loop in backwards or upside down so it holds water.
                            Agree, an upwards loop from the hulls vent fitting is how It should be, same for the fuel vent, holding tank vent not such a big deal if ya get some exterior water in there.
                            Dave
                            Edmonds, WA
                            "THE FIX"
                            '93 2556
                            Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

                            The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
                            Misc. projects thread
                            https://www.baylinerownersclub.org/f...56-gctid789773

                            Comment


                              #15
                              Sorted my issues yesterday. Turns out my vent WAS plugged... badly. Gave it a few blasts of high-pressure water, and it opened up a tiny bit, but still took a lot of effort to blow even a little air through it... so I just bought a new one. 10 minute job to replace and voila, airflow! Before hooking up the vent hose, I back flushed it using the freshwater hose at my slip. The hose itself is pretty nasty looking, and definitely needs replacing... but I didn't have time to get into that yesterday. It's a reasonably short run, but I suspect it's going to be a bugger to deal with since the opening it goes through is VERY tight. The other issue was the pump wasn't shutting off at pressure and I was getting some fizziness at the tap, suggesting air getting in somewhere. I had bought a new pump some time ago, so I pulled all the fittings apart at the old pump to replace it with the new one and it turns out that one of the fittings on the suction side had not been put together with any PFTE tape or compound (a non-compression fitting). It wasn't leaking any water, but being on the suction side I could see how that might suck a little air in... especially since my vent was plugged causing a large vacuum to build up on that side of the system whenever the pump was on.

                              Anyway, long story short, new vent, vent hose backflush and new pump has sorted the issues. I might do one more sanitize with bleach to make sure whatever nasties I flushed back into the tank are dealt with. I'll take the old pump apart and see what needs doing... might be able to service the pressure shutoff switch and keep it as a spare.
                              Tyson, Ackerley, Sidney & Gene
                              Tsawwassen, BC
                              1996 2858 Ciera Command Bridge
                              Mercruiser 7.4L BRAVO II (GEN. V) GM 454 V-8; Engine Serial 0F603347
                              "Island Passport"
                              Home marina: Point Roberts, WA

                              Comment

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