Announcement

Collapse

Posts are Subject to Edit

Posts added to a thread in this channel may be edited by a moderator. Non-applicable and/or duplicate posts may be deleted or combined into a single post.
See more
See less

Siphon Action Draining Water Tank - Problem Solved!

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #61
    Originally posted by TucsonJim View Post

    Keith,

    I have a valve installed and it made no difference at all. I could stop the flow with the valve, but even after more than half the tank was gone, the flow would start right back up as soon as I opened the valve. I believe that no air was getting into the system and the flimsy water tank was collapsing. It's never been this bad before.

    Jim
    Other than dropping the belly I would suggest something like I installed. It's been working perfectly. You don't need the air vac I used. Just cover the pipe end with a screen. Even with the new design there will still be some surge loss while driving. My set up prevents even that. Hope this helps
    Keith
    2018 Reflection 150 Series 220RK 5th wheel, SteadyFast system, Star White 2022 F350 King Ranch CC Long bed (HAL), B&W 25K OEM Companion

    Comment


    • #62
      Originally posted by TucsonJim View Post
      I'm can't wait any more. I need to drop the underbelly and apply Rob's fix. A couple of weeks ago, I filled my fresh tank and let it go too far. It started to spill out of the overflow. I could not get it to break the siphon no matter what I tried. I pressed the input valve to let air in, and there was no stopping it. I ran a few gallons of water out of one of the faucets, and the overflow kept spilling out. I opened the drain valve which did nothing more than start draining the water out of both the overflow and the drain valve at the same time. Water was still coming out of the overflow tube when I was at only 1/3 of a tank. The only way I could get the flow to stop was to use my compressor to pump air into the overflow! This has to be terrible on the fresh water tank. Now, I just need some cool weather here in Tucson before tackling this project.

      Jim
      Jim - a quick and easy solution......get a wine bottle cork from Andi (or other appropriate size stopper) and stuff it in the overflow tube ! I'm sure Andi has one (or maybe two lol) to spare ! If not, I'll have Carol send some your way.

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

      Comment


      • #63
        Originally posted by Canyonlight View Post

        Jim - a quick and easy solution......get a wine bottle cork from Andi (or other appropriate size stopper) and stuff it in the overflow tube ! I'm sure Andi has one (or maybe two lol) to spare ! If not, I'll have Carol send some your way.

        Dan
        Thanks for the laugh this morning, Dan! 🤣🤣. But I’m not sure where you got the idea that I might have wine corks 😉
        Andi
        Brookings SD
        2018 Reflection 337RLS
        2019 GMC Sierra 3500HD Duramax

        Comment


        • #64
          I would imagine that even though it is inside of insulation that the warmer that it gets the more flexible the tank becomes.
          Jerry and Kelly Powell, with Halo, Nash, Reid, Cleo, and the new baby kitty Rosie..
          Pilot (Zebulon), NC
          2020 Solitude 390RK-R

          Comment


          • #65
            My 295RL has the over flow and vent tunes shown in post 51. I can leave the campground with full tank and by the end of a 200 mile drive I show 1/3 tank of water. It’s constantly loosing 2/3 of water. I shut off water when vent overflow starts dripping let it rest for a few minutes and top off..I’ve checked under trailer for sagging ; all looks good and passes test of pushing on underbelly. Any suggestions ?

            Comment


            • #66
              Originally posted by Bobsrv View Post
              My 295RL has the over flow and vent tunes shown in post 51. I can leave the campground with full tank and by the end of a 200 mile drive I show 1/3 tank of water. It’s constantly loosing 2/3 of water. I shut off water when vent overflow starts dripping let it rest for a few minutes and top off..I’ve checked under trailer for sagging ; all looks good and passes test of pushing on underbelly. Any suggestions ?
              Only fill the tank until the gage says its full. This will leave an air gap at the top of the tank and not let the water start the syphon action from filling, also recommended by GD to only fill to the indicated full level.

              Brian
              Brian & Michelle
              2018 Reflection 29RS Oct.2017 build date, EMS-HW50C , Lippert Remote
              2015 Chevy 3500HD CC LB Duramax , Reese Elite 18K

              Comment


              • #67
                The mod in the link below solves all issues with siphon, slosh and tank collapse. A high flow (to match forced fill) single vent high on the side of the rig with no overflow would be ideal during manufacturing as a permanent fix to these issues.

                https://gdrvowners.com/forum/operati...ent-water-loss


                Jim
                2017 Imagine 2600RB
                2015 GMC Sierra 4x4

                Comment


                • #68
                  Originally posted by Bobsrv View Post
                  My 295RL has the over flow and vent tunes shown in post 51. I can leave the campground with full tank and by the end of a 200 mile drive I show 1/3 tank of water. It’s constantly loosing 2/3 of water. I shut off water when vent overflow starts dripping let it rest for a few minutes and top off..I’ve checked under trailer for sagging ; all looks good and passes test of pushing on underbelly. Any suggestions ?
                  You are the first to report that the twin overflow “doesn’t work”. Grand Design did bench testing to confirm that the second tube would break the siphon in the first . . . before implementing this design across all their product lines. It was never claimed that this design would stop “slosh pumping” out the overflow, but if this sets up a siphon, the water will stop flowing.

                  If you drive a particularly rough or twisting route, I can see how this continual motion could pump a lot of water out the overflow/vent lines. Raising the overflow to considerably higher than the tank (as described in recent posts on this thread) or capping the existing overflow(s) while travelling would be your only alternatives.

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

                  Comment


                  • #69
                    Bobsrv You could try clipping the shorter line as close to the coroplast as reasonable as this will help increase the imbalance needed for the system to work. The issue I see is that if both lines get full of water, the siphoning will continue. The different length lines in theory should stop the siphon, however, it's not a 100% guarantee. Something has to create an imbalance in the 2 lines (one being shorter showed to be enough) which will result in reverse flows of the 2 lines.
                    Joseph
                    Tow
                    Vehicle: 2018 GMC K2500 Denali Diesel
                    Coach: 303RLS Delivered March 5, 2021
                    South of Houston Texas

                    Comment


                    • #70
                      Jlawles2
                      Hi Joseph,

                      You are absolutely correct that a difference in tube length would be the best configuration . . . for the reasons you describe. Grand Design missed this part of my recommendation and bench tested with tubes of more-or-less the same length. The concept still worked. I think this is in part because one tube feeds two tubes at the highest point. The one vent tube coming out of the tank can’t supply enough water to fill both down tubes and this helps to draw air in through one of the tubes and break the siphon.

                      Rob
                      Last edited by Cate&Rob; 08-12-2022, 06:44 AM.
                      Cate & Rob
                      (with Border Collies Molly & Angel)
                      2015 Reflection 303RLS
                      2022 F350 Diesel CC SB SRW Lariat
                      Bayham, Ontario, Canada

                      Comment


                      • #71
                        Why not use one larger single tube for the downward vent if two tubes of the same diameter are more than the tank overflow can fill. Use one 3/4 inch or 1 inch tube, as water partially fills the tube and flows down, air can flow up. Anybody ever try that? Like all downward vents it won't stop slosh spill.
                        Ted
                        2021 Reflection 310RLS
                        2020 F350 PS,CC,LB,SRW

                        Comment


                        • #72
                          Originally posted by TedS View Post
                          Why not use one larger single tube for the downward vent if two tubes of the same diameter are more than the tank overflow can fill. Use one 3/4 inch or 1 inch tube, as water partially fills the tube and flows down, air can flow up. Anybody ever try that? Like all downward vents it won't stop slosh spill.
                          Hi Ted,
                          That idea was definitely discussed (and I think it would work) but it was important to Grand Design that the proposed solution be constructed from easily available "parts on hand". Sourcing a connector to go from the standard 3/4" Pex drain tube to a larger diameter plus adding different size tube and clamps than used anywhere else in the assembly plant . . . was not their preferred solution.

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

                          Comment


                          • #73
                            Cate&Rob interesting. They already use large tube for gravity fill, didn't need to be pressure tube.
                            Ted
                            2021 Reflection 310RLS
                            2020 F350 PS,CC,LB,SRW

                            Comment


                            • #74
                              I filled my tank to 2/3 full before leaving Valdez drove 120 mile and arrived with 1/3 tank. I’m sure water is draining out on all hills we climb. On a slight grade on a view point turn out II had a a-trail of water from over flow tube.

                              Comment


                              • #75
                                Originally posted by Bobsrv View Post
                                I filled my tank to 2/3 full before leaving Valdez drove 120 mile and arrived with 1/3 tank. I’m sure water is draining out on all hills we climb. On a slight grade on a view point turn out II had a a-trail of water from over flow tube.
                                When you completely fill the tank to overflowing and stop filling, does the overflow stop or does it set up a siphon action, drawing in the bottom of the tank and continuing to empty the tank? This is the situation that the twin overflow is designed to stop.

                                Sloshing water out the overflow while driving is a different problem that can only be remedied by closing the overflow while moving and perhaps installing a higher vent location as previously discussed. Your tank sits crosswise with the vent at the centre top of the tank end. Attached picture and drawing from the Grand Design Parts Look-up information. It is curious that driving up a grade with a 1/3 full tank would allow water to reach this vent connection.

                                Rob

                                Click image for larger version

Name:	1660305350.jpg
Views:	51
Size:	124.9 KB
ID:	92366
                                Cate & Rob
                                (with Border Collies Molly & Angel)
                                2015 Reflection 303RLS
                                2022 F350 Diesel CC SB SRW Lariat
                                Bayham, Ontario, Canada

                                Comment

                                Working...
                                X