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Old 09-17-2008, 09:20 AM   #1
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Don't know how it is happening, but the tank is filling when connected to city water- is it going backwards through the pump? Like a check valve gone bad?
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Old 09-17-2008, 09:20 AM   #2
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Don't know how it is happening, but the tank is filling when connected to city water- is it going backwards through the pump? Like a check valve gone bad?
Tulsa Mike
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Old 09-17-2008, 09:32 AM   #3
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Most likely just need to turn your fill valve the other direction.
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Old 09-17-2008, 06:40 PM   #4
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There is a valve usually that lets you fill the holding tank from the city water fill. It's possible on your rig that the valve has worn out and is letting some flow into your holding tank when you are hooked up to city water. Try tracking it down and putting an ear up to a water line while you are hooked up. You may hear water running while all the valves in the rig are off.

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Old 09-17-2008, 07:59 PM   #5
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I had the same issue on our 96 Pace. My hookups are at the left rear and there is a valve to switch for filling the Fresh Water Tank. I opened and closed the valve several times and it seems to be okay now. There might have been some dirt or something caught in it not letting it close properly. I certainly hope so because it ain't so easy to change. It is held on with a 2-hole conduit strap and the fittings are the clamp type for the tubing. I think it takes a special tool to redo them. You have to take the bottom off of the piece that the valve is mounted to. Plus there ain't a whole lot of room to work.
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Old 09-18-2008, 05:57 PM   #6
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Check the fill valve first, but yes, if the check valve in the pump fails, water will back-flow into the tank when on city water.

You can test for this problem by disconnecting from the city supply and switching t the pump. If the pump brings the system up to pressure and shuts off, then comes back on again without anybody opening a faucet, you probably have a leaking check valve in the pump head. You can rebuild the head or replace the pump.
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Old 09-19-2008, 05:28 AM   #7
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I had the same problem and the way to check it is to disconnect the suction side of the pump and turn the city water on. If water comes out of the suction side the check valve is bad. I just put a check valve in line on the presure side of the pump and it fixed the problem.
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Old 09-22-2008, 08:41 AM   #8
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Thanks for some excellent answers - now that gives me a path to move forward with -
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