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Thread: Loosing Water From The Fresh Water Tank

  1. Print this Post   #1
    HTWT
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    Loosing Water From The Fresh Water Tank

    Loosing Water From The Fresh Water Tank


    Coley, maybe you can shed some more light on thisÖ

    Previously I asked the question about loosing water from the fresh water tankÖI have to ask again. We like to dry camp and when doing so we have to have all the water we can carry. I fill up at home and while traveling water leaks out. In 4 hours of traveling we loose 2/3 of the tank.

    Whatís bringing this to the surface again is last weekend we camped at a state park in TX and before we left I put some water in the tank for the ride home, just for the use of the facilities if needed. As we were leaving the park I pulled into the dump station and found myself on a hill, nose up. As I emptied the gray water tanks all the fresh water drained out of the tank through the drains under the trailer.

    This has nothing to do with walking away while filling the tanks or a ďreverse vacuumĒ as Scott previously replied (see previous posts below). As far as traveling with as little water as possibleÖI donít think we need to go there. Iím paying for the fuel and besides, the trailer does seem to ride better with a full water tank...maybe I have a center of gravity issue, Iíll work that one over the winter.


    I honestly think this is a design problem, I have the dealer looking at it now, itís in for winterization and some other little things.



    Thanks in advance, HTWT


    (Previous posts on the subject)
    (Original post from me)
    Loosing water from fresh water tank

    Has anyone had any problems with water leaking out the fresh water tank drain tubes. I fill up at home and when we get to our destination we have only 2/3 (or less) of a tank left. At home when I fill, the water gauge shows full and the overflow runs, canít put anymore in it. Additionally, it seems like the water pump is not as strong as it once was, water just seems to come out very slow. Shower works well after I changed the head.


    (Scotts first reply)
    One way that tanks empty...
    What happens often with fresh water tanks as large as ours if that the owners hook up their water hose to fill the tank and then walk away and wait for the overflow tubes to start kicking out water to let them know their tank is full. While this may be more convenient than waiting and watching the monitor panel to monitor the water going into the tank, it often results in a "reverse vacuum". What happens is, the tank becomes full, and the water begins to flow out of the overflow tubes, but that overflow is not able to keep up with the amount of water coming into the tank from the hose. The result is, the tank begins to swell. (Note: there have actually been some who have caused their tank to swell so much that it caused damage to the coach).
    Typically, a person stops the flow of water into the tank when they notice the overflow system kicking in - however - the tank may have already swollen up which means they can now have the reverse vacuum that I mentioned. It is very similar to cyphoning, in that the pressure now is going to go the other way, creating a vacuum, and emptying the water back out of the tank through the overflow lines. If a cyphone or reverse vacuum situation is created, it can actually keep going until the tank is 2/3rds to half way full before it stops. THAT is why some folks have problems filling their tanks up all the way.
    The answer: ALWAYS be sure to keep an eye on your monitor panel when filling up your fresh water tanks. This will dramatically cut down your chances to create the reverse vacuum effect and loose the water that you were waiting so patiently to put in to the coach.

    ST


    (Scotts second reply)
    Another Possibility
    Concerning those who noticed some water coming out of the overflow tubes while traveling up a hill - even if you are not traveling with full tanks, when the coach is on an angle, yes, the water can get itself all to one end or the other and reach the top of tank and thus result is some water going out of the overflow tubes which operate through gravity.
    One thing I will point out is that if at all possible, it is advisable to travel with very little water in your fresh water tank. This increases your cargo carrying capacity, your fuel mileage, and just makes the coach easier to tow down the road. Just a helpful hint.

    ST

    HTWT (Have Trailer Will Travel)
    2006 Bighorn 3400RL (6 Apr 05 )
    2004 Chevy 2500HD Silverado LT 4x4 Duramax

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    Southeast Regional Director, HOC davebennington's Avatar
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    We have had the same thing happen to us when we were out this past weekend. I filled the tank at home and when we got to the campground we were still dropping water from the overflow hose. Something is going on there.

    Dave

  3. Print this Post   #3

    Water Overflow

    While having four overflow vents (one at each corner of the top of the tank) can make for water loss during travel - what you are describing is not typical.

    When you say that the fresh water tank emptied when you pulled the gray tanks - that tells me that there is something up with your fresh water tank valve. We need to make sure it is closed all the way, and that it operates correctly - opening and closing off.
    It obviously shouldn't empty out when the gray tank valves are opened.
    We need to get your valves checked at a dealer to confirm whether or not they are operating correctly.

    ST

  4. Print this Post   #4
    HTWT
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    Loosing Fresh Water

    Scott, I didnít mean to imply that the fresh water tank emptied when I pulled the grey water valves, it emptied while on the hill, nose up. It didnít have anything to do with the grey water valves, I just happened to be emptying the tanks at a dump station that was on a hill. The fresh water was draining from at least one (I didnít look to see which ones were draining) of the three drains rear of the back tire as soon as the nose was tilted up hill. The same thing happens from starts from stop signs or traffic lights. Ironically, the dealer just called me back, I had him winterizing and checking out a few other things and he said exactly what you said, the drains are on top of the tank, water just comes out while the trailer is tilted or from starts after stops. This leaves me back to the design issue. I think, unless you have a lot of problem with this, Iíll cap the drains when I want to travel with a full water tank, else Iíll just loose water on the trip and fill up every morning at the campground before we leave. Just another step I guess. If you figure out what to do, as of now we plan on attending the rally in June, maybe we can do something there. Thanks, Rich
    HTWT (Have Trailer Will Travel)
    2006 Bighorn 3400RL (6 Apr 05 )
    2004 Chevy 2500HD Silverado LT 4x4 Duramax

  5. Print this Post   #5

    Fresh Water

    Though we use large tanks in our coaches, they are relatively shallow, which allows for better weight distribution across the coach. With the overflow vents at the top of each corner of the tank, when you lifted the coach up on an angle, the back two vents began to let the water out. Short of installing a shut off valve on those overflow lines, I'm not sure what the solution is. I know we have to have the overflow vents/lines for code.
    I will talk with engineering again to see what we can look at in the future to avoid the loss of water when a person is traveling. As far as parking on an incline, that will always cause the water to flow out one of the overflow vents, so there's not much to do about that without some sort of shut off - which I'm not sure is legal per code. I'll check into it.

    ST

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    Senior Member BluegrassMan's Avatar
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    Losing Water

    Hi All:

    I have NOT experienced water Loss on our G. Canyon yet. I have gone DRY camping 3 times this summer.

    THOUGH on our 98' Sea Breeze, the overflow tubes (2) were at my third axle UNDER the trailer. When I would chuck the tank full, the sloshing going down the road, would cause a cyphoning situation to take place. I placed vinyl caps over the hoses NO MORE 2/3 full tanks! When you arrive at your destination, you DO have to crawl under and slip them off so that the pump can pump.
    Denny, Rosa, & Tara(spoiled Pug) -08' F-450 King Ranch, Grand Canyon #286 (W/Granite)
    "other Toys" 05' Harley Fatboy,47 Ford Streetrod (under construction)

  7. Print this Post   #7
    HTWT
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    BluegrassMan, Thanks for the input, but why only 2/3 full?
    HTWT (Have Trailer Will Travel)
    2006 Bighorn 3400RL (6 Apr 05 )
    2004 Chevy 2500HD Silverado LT 4x4 Duramax

  8. Print this Post   #8
    BigBlue
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    Quote Originally Posted by Scott
    Though we use large tanks in our coaches, they are relatively shallow, which allows for better weight distribution across the coach. With the overflow vents at the top of each corner of the tank, when you lifted the coach up on an angle, the back two vents began to let the water out. Short of installing a shut off valve on those overflow lines, I'm not sure what the solution is. I know we have to have the overflow vents/lines for code.
    I will talk with engineering again to see what we can look at in the future to avoid the loss of water when a person is traveling. As far as parking on an incline, that will always cause the water to flow out one of the overflow vents, so there's not much to do about that without some sort of shut off - which I'm not sure is legal per code. I'll check into it.

    ST
    Scott
    Is the black water tank shallow also? If so that might explain why I don't get the draining action I had from my old trailer. The pressure head isn't as high as my old one.
    Jim & Pat
    States Visited


    2003 C4500, CC, dually, 5:13 rear, 8.1 gas
    2006 Landmark, Monticello #4804


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    Senior Member BluegrassMan's Avatar
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    Losing Water

    Hi All:
    As I was stating, on my 98', I was losing approximately 1/3 tank of water on a 60 mile trip. If I had gone farther, I'm sure it would have been worse. I usually just put in about 20 gallon or so on a regular trip, then use the campground's water. REMEMBER ! Water is 8.83 pounds per gallon !

    The plugs that I used were a flexible red vinyl just the right size to push on, and were tight enough not to fall off along the way.
    Denny, Rosa, & Tara(spoiled Pug) -08' F-450 King Ranch, Grand Canyon #286 (W/Granite)
    "other Toys" 05' Harley Fatboy,47 Ford Streetrod (under construction)

  10. Print this Post   #10
    Senior Member
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    We never have (with this railer)filled the fresh water tank.we put in just enough for travel so we haven't experienced any loss yet.That I know of ,that is..But say Bluegrassman,I wonder if one could extend the vents to the side of the unit and then put on a small brass shut off valve where it would be easier to reach ?

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