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Old 09-23-2017, 01:53 PM   #1
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Another Water Disappearance Mystery

Hello All,

I am having a time trying to figure out what happened to my 3/4 tank of fresh water after I use the dump station. When I dump my grey and black holding tanks upon leaving an RV park, I use the jacks on the opposite side of my Adventurer so that both holding tanks are completely empty. (Then I use a special hose to run a small amount of water into the black tank and then drain it). My fresh water tank always empties completely at some point after dumping my grey and black tanks, though I do not know where the water goes or when the emptying occurs!! Upon stopping again after my day's travel, my fresh water tank (which is usually at least 1/2 full) is COMPLETELY empty! I'm very careful what kind of water I put into my fresh water tank, and I do not like to have it disappear! What is going on? Can anyone tell me if they have experienced this and how to remedy it?
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Old 09-23-2017, 02:16 PM   #2
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Is the water perhaps going into the black tank? Have you checked to see if black or grey tanks show an increase? Many RVs will allow water to siphon out of the water tank through the overflow vent hoses. Maybe tilting the RV has allowed water to drain out after you get on the road. If you tow a car, does it show water spots from a draining tank?
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Old 09-24-2017, 07:55 AM   #3
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Try not using your special hose and tilting the MH and see if the water still disappears.
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Old 09-24-2017, 08:20 AM   #4
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Quote:
Originally Posted by Al Spivey View Post
Hello All,

I am having a time trying to figure out what happened to my 3/4 tank of fresh water after I use the dump station. When I dump my grey and black holding tanks upon leaving an RV park, I use the jacks on the opposite side of my Adventurer so that both holding tanks are completely empty. (Then I use a special hose to run a small amount of water into the black tank and then drain it). My fresh water tank always empties completely at some point after dumping my grey and black tanks, though I do not know where the water goes or when the emptying occurs!! Upon stopping again after my day's travel, my fresh water tank (which is usually at least 1/2 full) is COMPLETELY empty! I'm very careful what kind of water I put into my fresh water tank, and I do not like to have it disappear! What is going on? Can anyone tell me if they have experienced this and how to remedy it?
you do not list the year and model of your coach. this info would help. For the record our coach dumps the fresh water each time we make a left hand turn. The fresh water vent is poorly designed, the tank its self is not very tall and allows for the water to surge to vent and drain onto the road with each left hand turn. The vent should have had a riser above the tank to prevent water from draining but there is no room for this. So the vent comes directly off the top of the tank, makes a 90 and turns to the ground. Also the vent pipe is large, 1/2 inch allowing a good flow. I have made a modification to try and slow this draining of the fresh water. I installed a valve on the vent pipe so I can control the vent tube size. I will allow some venting so the water tank does not expand and contract with altitude changes. I suspect I will still lose water but I think I will slow the loss considerably. On the road day after tomorrow and we will see.
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Old 09-24-2017, 08:24 AM   #5
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Dont think you need to use jacks to empty the tanks. You could possibly crack your windshield doing this as well. Maybe this is tilting it higher than the vent and siphoning out. You should see water on the ground if this was the case. Im not aware of any direct lines from the fresh to waste tanks.
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Old 09-24-2017, 08:47 AM   #6
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Another Water Dispperance Mystery

Thanks for all help. I forgot to say that my motor home is a 2004 Winnebago Adventurer 35 U on a Workhorse chassis. Never had this problem before even though I have left campgrounds with a full tank, Could it be that there is a siphoning off of water due to a overflow pipe somewhere in the tank. Maybe others have had this issue. What did you do to prevent this and just HOW can this be fixed. I have tried leaving the exterior filler tank port open while filling to prevent any air build up but that does not seem to help. HELP PLEASE
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Old 09-24-2017, 03:21 PM   #7
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This is a recurring topic. I put a valve on mine. You can do a search for other Solutions.
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Old 09-24-2017, 03:25 PM   #8
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I am curious as to what is special about the hose you use to run water into the black tank? What water supply you hook it to, and where you put the other end?
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Old 09-24-2017, 03:57 PM   #9
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They probably mean special only for poop hose. Although I thought they had a rinse connection in the water section of the basement. Which I might add is quite effective.

My 38R of the same year has a touchy overflow. It piddles off level easily.

What can make it worse is if your overflow tube is too deep in the tank. Once it starts piddling it can suck your tank dry. So you are probably getting it started putting it off level (Hopefully your fridge is off so you donít kill it) and then putting it straight isnít enough to stop the siphon.

We had ours at the mech getting a once over. He parked it at a weird angle and we had no water when we picked it up.

If its not piddling out from under the coach then you need to have a close look at your process like others have said cause ur doing something wrong.
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Old 09-24-2017, 07:04 PM   #10
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Had a similar issue with my '02 Journey. The fresh water tank has a 1.5" drain directly underneath the middle of the RV, to dump the tank when winterizing. Hard to see any drip or puddle in the best of circumstances without crawling under the rig. It also had a remotely actuated drain valve. A mini guillotine valve that was notorious for leaking in this application.

What would happen is when the tank was filled, as you drove down the highway, the suction caused by the slipstream would siphon water out of the drain. And when arriving at your next destination, the occasional drip had become a fairly constant drip. Or the tank would be empty.

Once I figured that out, I just got an expanding rubber stopper and stuffed it in the drain pipe. No more lost water.
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Old 09-25-2017, 08:12 AM   #11
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Thanks Jim, I think this will solve my problem. Stuff the overflow pipe with a stopper is by far the easiest and less invasive way to stop any water siphoning. I will have to always remember to not overfill the tank with the initial water fill up. Most logical repair. Keep the exterior tank fill open to allow the air out of the tank. Thus no need for the overflow pipe being used at all. Thanks for the easy fix. Al
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Old 09-25-2017, 10:32 AM   #12
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Quote:
Originally Posted by Al Spivey View Post
Thanks Jim, I think this will solve my problem. Stuff the overflow pipe with a stopper is by far the easiest and less invasive way to stop any water siphoning. I will have to always remember to not overfill the tank with the initial water fill up. Most logical repair. Keep the exterior tank fill open to allow the air out of the tank. Thus no need for the overflow pipe being used at all. Thanks for the easy fix. Al
I'd seriously suggest you re-route the overflow/vent rather than plug it. A very small change in elevation or air pressure would allow expansion or compression of the tank. This could put pressure on the surrounding structure or the tank, causing failure or permanent loss of water. If you've ever seen large airbags used to lift a truck or car, you know a little air pressure, spread over a large surface is a powerful force.

If the problem is poor installation of the vent line caused by being inserted too far into the tank and creating a siphon effect, a plug isn't the solution. Modify the hose dipping into the tank so it doesn't dip so far into the tank. On the upward loop of the vent hose, a small hole drilled in the top of the loop will draw air in and break up the siphoning action.
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