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Old 05-25-2018, 08:48 PM   #1
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Fresh water overflow

Struggling to find info to fix the fresh water overflow issue when filling...specifically 25% of the water siphoning out. I believe it is a simple fix but I want to see the thread before I tackle it.
2014 38’ DS
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Old 05-25-2018, 09:04 PM   #2
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If you can access the overflow hose, poke a small hole in it at the top of the loop. That will break the siphon action.
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Old 05-25-2018, 09:11 PM   #3
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Check this thread for how others have done the mod.

Fresh Water Overflow Mod

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Old 05-25-2018, 09:20 PM   #4
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After seeing the thread on this issue, raising the hose to make a bigger loop up and a small hole in the top of the hose at the top of the loop will stop the siphoning action. Most of the time the hose will not be full of water and water will fall down the hose out the bottom. I don't think you'll ever have water spraying out the small hole. The only time you'd have enough water flow would be to run the city water hose for so long you overfill the tank and force a continuous flow out the overflow line.
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Old 05-25-2018, 09:21 PM   #5
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I had the same problem and the solution was what BFlinn suggested.
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Old 05-25-2018, 11:33 PM   #6
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Being me, rather than just poke a hole in the tube, I think I would put a tee at the top of the loop with some kind of check valve that would block water from going out but allow air in to break the siphon.

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Old 05-26-2018, 06:58 AM   #7
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Have a look at post #10 in this link (btw, it’s the same link as provided above). In addition to the extended loop and pin hole, basically I raised my existing air admittance valve, and this worked great.

Fresh Water Overflow Mod
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Old 05-26-2018, 07:46 AM   #8
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Phil,

I do not think the hole is not needed as long as you have the loop high enough to stop the slosh effect and I like the high admittance valve idea. The air admittance valve can leak and if high enough like your picture it will not matter.

Look at pictures that siphon and if you have siphoned in the past the hose has to be in the liquid when the siphon gets going. If you pull the tube out of the liquid the siphon stops since air is introduced.

The same is true when the water level falls below the overflow connection on the tank air is introduced from the tank to break any siphon effect. The overflow line is not in the liquid.
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Old 05-26-2018, 08:12 AM   #9
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I raised the AAV valve only and have fewer problems with water loss. Still does lose a little but have not noticed the large losses we have experienced.
My main concern on the AAV was it would leak at times with gentle water sloshing. Raising and replacing it solved 2 problems.
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Old 07-07-2018, 03:45 PM   #10
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Here is what I did to stop the water loss while traveling

I do not have room to add a raised loop on my overflow drain.
So here is what I did to stop the water loss while traveling.

I did install an overflow drain shut off valve.
Adding the valve is controversial, but I think its just about fool proof.

First of all, most people shouldn’t even have the water loss problem because it only happens when the water tank is above +/- 2/3 full. That’s way more water than anyone needs while traveling to most destinations that will have a water source there.

But for those of us that set out to more remote locations and water is not available, you need all the water you can carry to be able to last up to a week or longer.

So to make this fool proof, I piped the overflow drain over next to the water fill valve.

This way it is very visible and easy to use.
The only time I would need to close the valve is for those more remote trips.
Otherwise, the system works as originally designed.

Take a look at the following pictures
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