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Old 08-02-2022, 04:46 PM   #1
shovelhead86
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Fresh water

Help!! I cant find it. my freshwater tank goes empty with the pump turned off and we are on city water. It will loose almost a full tank of water in a little over a month, We are parked in a campground for 6 months. There is no sign of a leak anywhere. No wet spots under the camper but about 60 gallons disapear. If the pump was on I would say I must not have heard it run. But it is loud and turned off. Thanks I know there are some good heads out there.
 
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Old 08-02-2022, 05:27 PM   #2
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A gallon per day is a fairly small leak. You will likely need to remove the coroplast and take a good look around to find it.
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Old 08-02-2022, 06:14 PM   #3
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Originally Posted by shovelhead86 View Post
Help!! I cant find it. my freshwater tank goes empty with the pump turned off and we are on city water. It will loose almost a full tank of water in a little over a month, We are parked in a campground for 6 months. There is no sign of a leak anywhere. No wet spots under the camper but about 60 gallons disapear. If the pump was on I would say I must not have heard it run. But it is loud and turned off. Thanks I know there are some good heads out there.
I'm confused. You say you're on city water. If so then you wouldn't be using the pump or the fresh water tank. Are you sure you filled the tank? I would refill and confirm that it's full. Turn on the pump and switch form city to tank. Run a faucet, purge the air switch back to city and shut off the pump and monitor
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Old 08-05-2022, 11:26 AM   #4
shovelhead86
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Fresh water

This is not a new problem. It has been happening for at least a year. 60 gallons is a lot to leak into the belly without it dripping out onto the ground. I just filled it yesterday and I will see how many days before it is empty or low again.
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Old 08-05-2022, 05:19 PM   #5
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After you fill it up, wait a couple of days and then look for a low hanging area under the rv. I would remove a couple of screws at the low spot and look in with a flashlight to confirm if water is sitting there.

Have to start somewhere.
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Old 08-05-2022, 05:54 PM   #6
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When you fill the tank how do you confirm you actually have water in the tank?
You are loosing 2 gallons a day. It looks like it would show up somewhere.
Could the high pressure city water be sucking the water out of the tank like gas is sucked out of a carburetor?
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Old 08-05-2022, 07:07 PM   #7
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What mlh mentioned is theoretically possible I guess, although I can’t see a way it could happen in the trailer. But that is how some hose end sprayers work, water flowing over an orifice siphons fluid from the jug up thru a tube to mix with the spray water. And strange things can and do happen. Maybe a select valve not fully positioned.
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Old 08-05-2022, 07:14 PM   #8
mlh
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Bill if that happened where would it be?
Sounds like a long shot but the water hast to be going somewhere.
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Old 08-05-2022, 08:24 PM   #9
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Lynwood- only two common points between the fresh water inlet and the fresh water tank. One is the NORMAL/FILL select switch that directs fresh water to the normal water lines OR to fill the fresh water tank. I am trying to visualize a half way position of the 3 way valve that would or could allow siphoning to occur. May have to get pencil and paper and sketch out the possibilities. But doesnít seem likely. Would seem water would flow into the tank when not siphoning.

Second would be the point the fresh water source pipe joins the fresh water pump/tank pipe downstream of the pump. Not sure exactly how that connection is made. The check valve would keep water from flowing into the tank. But I canít really see a way that siphoning could occur.
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Old 08-10-2022, 01:16 PM   #10
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Leak

My guess is it's enough to empty over time but not enough to drop onto the ground. The coroplast is likely holding it while it evaporates. I'd drill some very small holes in the coroplast to see if the water leaks out.
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Old 08-10-2022, 02:50 PM   #11
Fishin2dMax
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Originally Posted by shovelhead86 View Post
Help!! I cant find it. my freshwater tank goes empty with the pump turned off and we are on city water. It will loose almost a full tank of water in a little over a month, We are parked in a campground for 6 months. There is no sign of a leak anywhere. No wet spots under the camper but about 60 gallons disappear. If the pump was on I would say I must not have heard it run. But it is loud and turned off. Thanks I know there are some good heads out there.
Even if you're connected to city water directly with a pressure reducer, I've had my pump run for very short spurts even with city water connected, I discovered it occurred during times of low city water pressure and my pump switch was in the on position by mistake. Also, had a similar issue but in reverse, I found a bad check valve causing my city water to slowly fill the water tank. I guess it could be remotely possible to have a bad check valve (or installed backwards) allow water to be siphoned from the fresh water tank when using city water.
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Old 08-10-2022, 02:58 PM   #12
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My guess is it's enough to empty over time but not enough to drop onto the ground. The coroplast is likely holding it while it evaporates. I'd drill some very small holes in the coroplast to see if the water leaks out.
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