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Siphon Action Draining Water Tank - Problem Solved!

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  • Siphon Action Draining Water Tank - Problem Solved!

    Back in February, we debated the latest ideas on how to stop the siphon action that can drain a substantial amount of water from a full water tank. About post #62 (of 96!) I suggested that a second parallel overflow pipe would break the siphon vacuum in the first and stop the draining. There were several ideas about taking this second vent line higher and/or to remote locations . . . but, this is not necessary. The entire discussion is here https://gdrvowners.com/forum/operati...esh-water-tank for anyone who wants to read through it.

    At a recent meeting between the moderators of this forum and Grand Design, I proposed this idea as first described back in February and as detailed in the attached pdf. Grand Design proceeded to investigate this concept and have advised that their testing has proven that this idea works to stop the siphon action and they will begin installing the double overflow pipe across all production lines.

    Updating an existing system to this design should be relatively easy and inexpensive. All that is required is a Pex tee, a couple of short lengths of Pex pipe and a few Pex clamps.

    This fix will not stop "slosh pumping" while towing, but if this starts a siphon action, the double overflow will stop this with minimal loss of water. This fix will not require a shut off valve that needs to be remembered when filling or using water from the tank.

    Rob

    Breaking Water Tank Overflow Siphon.pdf
    Attached Files
    Last edited by Cate&Rob; 06-29-2021, 03:35 PM. Reason: Added a second copy of the same file since some are having trouble opening the first.
    Cate & Rob
    (with Border Collies Molly & Angel)
    2015 Reflection 303RLS
    2022 F350 Diesel CC SB SRW Lariat
    Bayham, Ontario, Canada

  • #2
    Originally posted by Cate&Rob View Post
    Back in February, we debated the latest ideas on how to stop the siphon action that can drain a substantial amount of water from a full water tank. ...

    At a recent meeting between the moderators of this forum and Grand Design, I proposed this idea as first described back in February and as detailed in the attached pdf. Grand Design proceeded to investigate this concept and have advised that their testing has proven that this idea works to stop the siphon action and they will begin installing the double overflow pipe across all production lines.

    ​​​​​​....

    Updating an existing system to this design should be relatively easy and inexpensive. All that is required is a Pex tee, a couple of short lengths of Pex pipe and a few Pex clamps.

    ...

    Rob

    [ATTACH]n52087[/ATTACH]
    Super. Congrats. Great innovation and design.
    Terry and Patty (Dogs-Sophie and Tessa)
    2020 Reflection 297RSTS - bought Oct 2019
    2021 F350 crew cab, SRW, 6.7L diesel, 14K equal-i-zer hitch

    Comment


    • #3
      Great job Rob. This vent is henceforth called the "Rob Vent".

      As soon as my hand heals up, I'll implement the change and let you know the outcome. My rig has been especially prone to this phenomenon.

      Jim
      GDRV Forum Moderator
      GDRV SW USA Rally Support Coordinator

      Jim and Ginnie
      2017 Reflection 297RSTS

      Comment


      • #4
        Awesome, Rob ! With the significant number of folks posting water loss as an aggravation (or worse) over the years, this is good news. Well done to you and the other Mods./other folks/GDRV team involved !

        Dan
        Dan & Carol
        2014 303RLS Reflection #185 (10/2013 build)
        2012 Silverado LTZ Crew Duramax 2500HD - 2700/16K Pullrite Superglide

        Comment


        • #5
          Rob, 3/4 inch Pex? I am 95% sure that my vent tube is 1/2.
          Jerry and Kelly Powell, with Halo, Nash, Reid, Cleo, and the new baby kitty Rosie..
          Pilot (Zebulon), NC
          2020 Solitude 390RK-R

          Comment


          • #6
            Originally posted by ThePowells View Post
            Rob, 3/4 inch Pex? I am 95% sure that my vent tube is 1/2.
            On my 2017 Reflection, it's 3/4".

            Jim
            GDRV Forum Moderator
            GDRV SW USA Rally Support Coordinator

            Jim and Ginnie
            2017 Reflection 297RSTS

            Comment


            • #7
              My 2021 Reflection has 3/4 inch. My previous Open Range had 1/2 inch.
              Ted
              2021 Reflection 310RLS
              2020 F350 PS,CC,LB,SRW

              Comment


              • #8
                Originally posted by ThePowells View Post
                Rob, 3/4 inch Pex? I am 95% sure that my vent tube is 1/2.
                The last picture in the attachment to post #1 was sent to me by Grand Design. It is of the first Solitude built with the double overflow lines. They appear to be 3/4" if you compare to the 1/2" fill/supply line in the lower left of the picture. The overflow line on my Reflection is 3/4". Of course . . . some could be built with 1/2" overflow .

                Rob
                Cate & Rob
                (with Border Collies Molly & Angel)
                2015 Reflection 303RLS
                2022 F350 Diesel CC SB SRW Lariat
                Bayham, Ontario, Canada

                Comment


                • #9
                  Rob, do you mind if I send the PDF to my brother who is a member of the Open Range forum? They have the same problem.
                  Jim (& Sharon)
                  2015 GD Momentum 385TH w/ Joy Rider shocks, Sailun 637s & 3" Garage extension, LifeBlue Lithium.
                  2015 Ford F-350 DRW 4x4 Lariat w/ AirLift bags, Titan 65 gal. OEM replacement fuel tank.
                  The toys:
                  2017 RZR XP 1000 EPS SE
                  2018 Fiat Abarth Cabrio

                  Comment


                  • #10
                    Originally posted by JCR GD View Post
                    Rob, do you mind if I send the PDF to my brother who is a member of the Open Range forum? They have the same problem.
                    Hi Jim,

                    Since I have posted this information on an open forum, it is (technically) available to anyone. If you want to provide this to another forum, I would prefer that you used the attached version titled "Solving Water Tank Vent Siphon". This still describes the idea and identifies more clearly where it came from but removes the direct confirmation that Grand Design is going to implement this.

                    Rob

                    Solving Water Tank Vent Siphon .pdf
                    Cate & Rob
                    (with Border Collies Molly & Angel)
                    2015 Reflection 303RLS
                    2022 F350 Diesel CC SB SRW Lariat
                    Bayham, Ontario, Canada

                    Comment


                    • #11
                      Originally posted by Cate&Rob View Post

                      Hi Jim,

                      Since I have posted this information on an open forum, it is (technically) available to anyone. If you want to provide this to another forum, I would prefer that you used the attached version titled "Solving Water Tank Vent Siphon". This still describes the idea and identifies more clearly where it came from but removes the direct confirmation that Grand Design is going to implement this.

                      Rob

                      [ATTACH]n52215[/ATTACH]
                      Ok thanks! He will (and they) will appreciate it!
                      Jim (& Sharon)
                      2015 GD Momentum 385TH w/ Joy Rider shocks, Sailun 637s & 3" Garage extension, LifeBlue Lithium.
                      2015 Ford F-350 DRW 4x4 Lariat w/ AirLift bags, Titan 65 gal. OEM replacement fuel tank.
                      The toys:
                      2017 RZR XP 1000 EPS SE
                      2018 Fiat Abarth Cabrio

                      Comment


                      • #12
                        Rob,

                        I'm glad you FINALLY got you constant drip problem resolved. There are other alternatives, but I'm glad you went to GD to get it fixed. )

                        So since I'm still under warranty for 30 more days...
                        Curtis, Christine, Cole, and Charlotte
                        2007 Chevrolet Silverado Duramax LBZ, CCLB
                        2020 Momentum 351M
                        2004 Essex Vortex

                        Comment


                        • #13
                          Hey Rob,

                          My brother posted the "solving" PDF and

                          First reply:
                          ingenious idea. Just goes to show GD RV'ers are just a little smarter!

                          Thanks again
                          Jim (& Sharon)
                          2015 GD Momentum 385TH w/ Joy Rider shocks, Sailun 637s & 3" Garage extension, LifeBlue Lithium.
                          2015 Ford F-350 DRW 4x4 Lariat w/ AirLift bags, Titan 65 gal. OEM replacement fuel tank.
                          The toys:
                          2017 RZR XP 1000 EPS SE
                          2018 Fiat Abarth Cabrio

                          Comment


                          • #14
                            This is my fix. I didn’t want to remove the underbelly covering. I installed a T with a shutoff that I leave open when I fill my tank. Once the tank is full I close the valve for travel. From the T I ran pex forward to the docking area. I haven’t had an opportunity to road test it but I know it will work based on information I discovered on another thread.
                            Rob, great to hear Grand Design has taken steps to resolve this issue. I was loosing 1/3 of my tank because of siphoning. Sorry about the rotated pictures.
                            Click image for larger version  Name:	B6B7C339-5FE0-4690-9B4F-F0B17414029C.jpeg Views:	0 Size:	101.8 KB ID:	56565
                            Attached Files
                            2020 Reflection 230RL
                            2020 Ford Super Duty F250 Lariat 6.7 CC 4X4

                            Comment


                            • #15
                              That's pretty cool that they went with your idea. Congratulations!


                              John
                              John & Jurie

                              Caretakers for Coco and Daisy

                              2016 Chevrolet Silverado 1500
                              2021 Transcend 260RB

                              2014 Toyota Tacoma TRD Sport
                              2017 Jayco 26BH
                              2020 Winnebago Micro Minnie 2108 FBS

                              Comment

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