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Old 03-17-2019, 04:37 PM   #1
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Fresh water tank overflowing

2012 Bounder 35K
When on city water the fresh water tank overflows. Replaced the check valve on the water pump, didnít help. Replaced the bypass/fill tank valve. Any other ideas?
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Old 03-17-2019, 05:26 PM   #2
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Those are usually the two candidates for causing this.

If you disconnect the inlet to the water pump you can see if any water is making it's way past the internal check valve. Same for the line from the city/fill valve, if accessible. This would eliminate these two mist often causes.
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Old 03-17-2019, 08:12 PM   #3
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If the fresh water tank is filling up rather fast, it's not likely to be the city/fill valve unless you can't close it all the way.

It is easy to get sand, grit, or similar into the water pump as it is usually before the water filter. When that happens, even a new flow check in the water pump can intermittently stick open.

I just added an external check valve and don't depend on the one in the water pump. It's a cheap and easy fix.
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Old 03-19-2019, 01:46 AM   #4
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Where exactly did you install the external check valve?
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Old 03-20-2019, 07:17 AM   #5
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I installed the check valve between the city water line and the water pump outlet where it goes to the input of the water filter. In the image below, the city water line (red circle) and pump output connect to the filter behind the panel as shown in RED.

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Water from the pump can go to the filter but water from the city fill cannot go through the pump and back to the fresh water tank.

The original pump output line ran to the hole below the pump and to the city water line and filter connection behind this panel.

The pipe going up and to the left connects to an accumulator tank to smooth out the water pressure when running on the water pump. It has nothing to do with the check valve blocking the city water.
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Old 03-20-2019, 11:03 AM   #6
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Check valve is usually put at the pump inlet from the tank, but your method sounds ok too. However, water can get to the tank only via the fill bypass or the pump, so it's got to be one or the other.
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Old 03-20-2019, 11:15 AM   #7
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Do you have the Anderson Valve (dial thingy) that allows water to go different places? I had the same problem when hooked up and ended up the "O" rings in the valve seemed to have either popped off or got "eaten" up by constant turning. I by passed all and went directly into the house water line till valve arrived. I just replaced the guts of the thing and not the whole valve. This may offer a different take on the issue.
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