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Old 07-03-2008, 04:55 AM   #1
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I am having a problem with my on board water system. I turned the pump on but I got no water, I thought that the pump had gone bad so I bought and installed a new one but I got the same result. While I was down in the hold where the pump is I opened the dump valve to the tank and started dumping water . About 2 minutes later the pump kicks on and starts pumping ?! Someone told me that the vent might be plugged and to hook a hose up and overfill the tank to flush the vent out. I did this but it didn't seem to help , is it possible that the overflow hose and the vent tube are in two different locations ??? I can't physically see the water tank so I'm at a loss as to how to unplug vent tube .


Anyone have any ideas?????
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Old 07-03-2008, 04:55 AM   #2
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I am having a problem with my on board water system. I turned the pump on but I got no water, I thought that the pump had gone bad so I bought and installed a new one but I got the same result. While I was down in the hold where the pump is I opened the dump valve to the tank and started dumping water . About 2 minutes later the pump kicks on and starts pumping ?! Someone told me that the vent might be plugged and to hook a hose up and overfill the tank to flush the vent out. I did this but it didn't seem to help , is it possible that the overflow hose and the vent tube are in two different locations ??? I can't physically see the water tank so I'm at a loss as to how to unplug vent tube .


Anyone have any ideas?????
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Old 07-03-2008, 05:50 AM   #3
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Alan,if you would post what rig you have,maybe someone with the same unit can help you.

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Old 07-03-2008, 06:20 AM   #4
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On my Winnebagos the pump would continuosly run without pumping water until I remembered to throw the water intake valve from "TANK FILL" to "CITY WATER" Then it works fine. I do that often!!!!
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Old 07-03-2008, 07:33 AM   #5
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Your pump switches on/off in response to pressure, typically coming on when pressure drops down below 45-48 psi. If the pump does not run, that suggests your system has pressurized enough to keep the pump off. The tank vent has nothing to do with the pump not running - you don't pump water into the tank - you pump from it and the tank is not pressurized.

If the pump will not run and no water comes out of the taps, I would guess that somehow a water line from the pump to the rest of the house system has become crimped or clogged somehow.

But if the pump runs but no water appears then the problem is different.
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Old 07-03-2008, 05:26 PM   #6
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The last time that I was able to get it to work I opened the tank drain valve, the pump came on and began pumping water. I let the pump run for a while then shut it off and after that it worked fine for the rest of that trip then sat for awhile ( a week or so)then when I went to use it I had the same problem again.

My motorhome is made by Monaco
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