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  1. #11
    Rolling Along
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    Quote Originally Posted by powerscol View Post
    As the dealer will need to drop the belly wrap to fix the leaking gray tank valves I plan to try and install what is called an air/vack valve (has a float to prevent water escaping but lets air in and out) above the tank T'eed in with the drain relocation. The air/vack will solve the operational issues while the drain valve will stop the draining while traveling. This is something GD should consider.

    Thoughts

    My new system did work for my short trip
    Winnebago installs a vacuum breaker on the fresh water tanks in their motor homes.

  2. #12
    Big Traveler
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    If this problem is caused by a siphoning action, wouldn't a tee with a riser higher than the top of the tank break the siphon? Powerscol's air/vac valve on the upper end of the tee would assure overflow while filling would not exit the upper end while allowing air to enter, breaking the siphon. I know siphoning gas using a hose with a small hole in it doesn't allow siphoning to last long. DAMHIK #gastastesreallyawful

  3. #13
    Site Sponsor
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    Its not a true siphoning action but rather the water sloshing in the tank and squirting out the vent pipe. If you go uphill or turn it does the same thing. There is a lot of power there with the water moving. Ill try and draw up a picture to indicate what I am up to.
    2018 Reflection 150 Series 220RK 5th wheel with 6K axle upgrade. B&W 25K OEM Companion, Steadyfast system, 2022 F350 SRW 6.7 King Ranch 8' bed, Trailer reverse lights, rear spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, and Solar

  4. #14
    Big Traveler
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    I haven't encountered this problem with our current trailer but our previous Jayco would lose a third or more of the tank. The water came out the overflow in a steady stream, it would do it sitting in the driveway. As soon as water came out the overflow it would start a siphon and collapse the top of the tank to the point it would stop, about a third. The tank was plastic and only about 8 inches deep, so it didn't have to move but a couple inches to drain a third. I could observe the tank doing this. I ended up installing a valve on the overflow as mentioned earlier, never had another issue with it.

    Curious to see your solution. I don't normally travel with a full fresh water tank but I probably will someday, don't want this problem.

  5. #15
    Long Hauler D2Reid's Avatar
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    I was following SOB up a hill the other day on my motorcycle. I was getting sprinkled on. So the problem is not exclusive to GD. Well I'm pretty sure it was the fresh water tank, I really hope it was the fresh water tank.
    Dallas
    2017 Momentum 376TH, 2019 Ford F450, Dual Rear Wheel, 4x4, diesel.
    2015 Harley-Davidson Street, XG750

  6. #16
    Long Hauler offtohavasu's Avatar
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    Quote Originally Posted by powerscol View Post
    Its not a true siphoning action but rather the water sloshing in the tank and squirting out the vent pipe. If you go uphill or turn it does the same thing. There is a lot of power there with the water moving. Ill try and draw up a picture to indicate what I am up to.
    Here is something I drew up as a recommendation in the plumbing section. Just looking for someone to test the theory.

    https://www.mygrandrv.com/fo...sting-Required
    Curtis, Christine, Cole, and Charlotte

    2007 Chevrolet Silverado Duramax LBZ, CCLB
    2020 Momentum 351M

  7. #17
    Site Sponsor gbkims's Avatar
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    I was as looking thru GD parts lookup to see what parts are listing in plumbing.
    See a small picture of the 54 gallon water tank that shows as used on some Reflections & Solitudes.
    The 54 gallon fresh water tank is rectangular, about 7.5" tall.
    Looks to have 2 fittings on the side for fill & vent, 1 on bottom for drain + level sensors.
    The vent/overflow fitting is almost to the top of the tank's side wall. Don't know if that just does a 90° down for the vent pipe.
    Does look very easy to slop water out.
    https://www.granddesignrv.com/owner-...rts/detail/438
    Fresh Water Tank During for a Reflection 303RLS posted by Janice while it was being manufactured http://www.mygrandrv.com/for...6&d=1401479628
    Pat Wardell's CAD of a fresh water tank from https://www.mygrandrv.com/fo...m-Grand-Design
    https://www.mygrandrv.com/fo...5&d=1473355808
    Aux Tank thread for Aux Fresh Water Tanks with Luv2ski's CAD drawings http://www.mygrandrv.com/for...5563#post75563
    About only other photos I could find for a similar tank were from an ebay listing that is same size & almost same layout without the bottom drain.
    https://www.ebay.co.uk/itm/RV-Boat-S...-/112983414214
    - Gene

    Kim & Gene
    2015 Reflection 317RST
    2017 Ram 3500 CC LB 4x2 6.7 CTD AISIN 3.73 DRW Auto Level Rear Air, BD3, Prodigy P3, Aux Tank

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