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Old 10-12-2018, 09:46 AM   #1
Winnebago Camper
Join Date: Apr 2016
Location: Midland Park NJ
Posts: 20
water tank constantly fills

2004 Winnebago Brave 32V. Whenever I hook up the city water my freshwater tank starts filling and will overflow. I found the water valve at the water panel had gone bad. I replaced the valve with a new valve and tested the new valve to be certain it would work properly. After installation, the tanks still fill constantly. CAN SOMEONE HELP?

Related issues I have may be that the water pump will pump water from a bucket but will not draw water from the water tank. This would tell me air is getting into the water feed line somewhere between the tank and the pump. I have not found the air leak as yet. QUESTION > where is the feed line from the tank to the pump? I would think it would be the PEX pipe fitting at the lower side of the water tank as opposed to a draw tube from the top of the tank.

Understand, if I had a 50 gallon water drum feeding the water pump the pump would draw water from the drum and the water would run directly into the fresh water tank. This is the case no matter where the city water valve is positioned.

I worked back and forth with the best RV plumbing expert "" has available. Twenty emails back and forth yielded nothing.
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Old 10-12-2018, 11:29 AM   #2
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The check valve on you demand pump has debri allowing it to backfill through the pump suction side.
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Old 10-12-2018, 02:54 PM   #3
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I found that when I have the issue, I turn off the city water and simply use the pump for a couple days to clear the check valve....
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Old 10-14-2018, 03:12 PM   #4
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Okay gang, all is back as it should be now. I tossed the plastic city fill valve and made my own assembly using a brass ball valve. It looks factory. This stops the water flow to the water tank when the valve is in the 'OFF' position. The plastic valve did not do the job. ALSO, the rest of my problems were fixed when I realized the new pump motor I had mounted (to replace the burned out pump) required a change of hose locations. I swapped the two hose lines and all is well now.
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Old 10-21-2018, 04:28 PM   #5
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Location: Cypress, TX and Woodland Park, CO
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Had the same issue with my new micro Minnie. Factory guy said there is a small tear in the water pump diaphragm. They sent a new water pump per warranty, I installed and no problem since. That might fix your issue.
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Old 10-22-2018, 08:36 AM   #6
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I had the same water fill problem, leaking through the valve, I installed a home water valve, in addition, I installed a home pressure regulator, my water pressure at home is 85psi and that broke the valve.
The cheap hose regulator doesn’t do the Volume of water needed for a decent shower.
I also added a pressure gauge to see what the pressure is in static and use mode.
2004 Itaska - Horizon
IKS40WD 350 Cummins
2012 Jeep Wrangler
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Old 03-16-2019, 06:43 PM   #7
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Location: San Antonio, Texas
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Where did you buy the home pressure regulator. Can yo post a pic of your installation? Thanks
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Old 03-17-2019, 04:28 PM   #8
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Response to question

Lowes, Home Depot, Menards I donít remember but they all have them. Water pressure regulator for a house, gives you the volume those cheap hose ones donít.
Also added a house water filter, pressure gauge, and a house on/off valve to fill the tank.
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