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Old 09-20-2012, 02:50 PM   #1
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Fresh water tank filling up when I am on City water.

I have a 2012 Itasca Impulse and when I woke up this morning, my onboard water tank was overflowing and I was on city water. Have check everywhere that I could get to and I was able to download a few of Itascas plumbing diagrams from there website, but still can't seem to be able to see where the problem might be. It was fine at the last campsite and happened overnight. Any ideas on what might be the problem. Is there suppose to be a check valve between the two systems that might be stuck open?
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Old 09-20-2012, 02:58 PM   #2
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You have the ability to transfer fresh water from city to your fresh water holding tank. There will be a control lever in your bay near the fresh water tank. Should be labled
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Old 09-20-2012, 03:17 PM   #3
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There are only two valves in that area, one is to dump the fresh water tank and the other is to winterize the water system. Nothing has changed from the last campsite that I stayed at and I didn't have the problem there.
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Old 09-20-2012, 07:26 PM   #4
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A valve would be my guess also. Mine is on the opposite sore of the tank where my water attachment is. One way to fill three tank and the other to run on city water. Turn tyre pump of so I'm not using both at the same time. I don't have an Itasca though.

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Old 09-20-2012, 07:34 PM   #5
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I would guess that it's a valve as well. I'd be surprised if it didn't have one. But if that's not the issue, it's probably your water pump. There are check valves built into it, and if they're not holding, they'll also fill the tank.
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Old 09-20-2012, 07:42 PM   #6
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And sometimes spell check is not your friend.
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Old 09-20-2012, 08:49 PM   #7
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Does your water pump run periodically when you are not hooked up to city water? If so, the seals in the pump could be leaking. When attached to city water, the water can flow backwards through the pump and fill the fresh water tank. Mine did this and I ended up replacing the water pump as I couldn't find a rebuild kit for the seals.
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Old 09-21-2012, 05:29 AM   #8
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Quote:
Originally Posted by tlkhorses View Post
And sometimes spell check is not your friend.
You must have the same problem I have fairly often - the word is spelled correctly, but it's the wrong word.
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Old 09-21-2012, 06:23 AM   #9
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We sometimes have the same problem... It's the parks water pressure. High pressure will leak past the valve everyone has mentioned. You'll need a pressure reduction system (not the cheap brass inline one) rather than a new "valve".
Watts has one for $50 bucks or so..... Available at Lowes/HD.

PS - It would seem that everyone got the gist of what was meant so is this an "english class" or a place where folks come for help with RV related problems?
"Let he who is without sin, cast the first stone"
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Old 09-21-2012, 06:40 AM   #10
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Had the same problem with a previous MH, changed the fresh water fill valve solved the problem.

Good Luck!!

By the way if that valve is leaking it will also cause the pump to cycle as water will leak back through the fresh water hose.
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Old 09-21-2012, 07:34 AM   #11
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It could be the one way check valve in the water pump. I had this problem and added a check valve after the water pump.
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Old 09-21-2012, 07:36 AM   #12
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Quote:
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You must have the same problem I have fairly often - the word is spelled correctly, but it's the wrong word.
This is not a spelling bee or an english class.
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Old 09-21-2012, 08:32 AM   #13
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OK, to answer the OP's question: It is either the city water/tank fill valve (unlikely) or the water pump. The water pump has a check valve and sometimes, if you have run the pump while connected to city water, it will begin to leak. Most likely the problem is in your water pump check valve.

I would exercise the tank valve fill valve just make sure that nothing is plugging something up. Then, turn off the city water, open a faucet and drain off the pressure. Turn on the water pump and let it pressurize the system. Turn it off and open a faucet to drain off the pressure. Turn on the city water again. You may have to repeat this a few times if the water doesn't stop flowing to the fresh water tank.

High campground water pressure is always a concern and you should have a pressure regulator in your system. However, I don't believe that is what is going on here.
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Old 09-22-2012, 07:14 AM   #14
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As advised by the OP, the CAMPGROUND is the only thing that was changed. The only thing that changes from CG to CG is water pressure.
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