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Old 02-11-2014, 11:04 AM   #1
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Water overflow

Hi, We are in Florida at a campground with a 2013 thor ace 29.2.Hooked up to city water and noticed fresh water tank is trickling out at fill spout on side of motorhome. City water has to be getting into my fresh water tank. Wondering if this has happened to anyone and what is the solution.Appreciate any help with this, thanks.
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Old 02-11-2014, 11:08 AM   #2
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Many rigs have a tank fill valve from the city water plumbing. It may be partly open or leaking by. Good luck.
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Old 02-11-2014, 11:10 AM   #3
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There can be a valve to switch to fill the tank, or the pump's check valve could be bad. Lucking your vent on the tank must work and you didn't blow up.
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Old 02-11-2014, 11:18 AM   #4
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fresh water has separate place on side of motorhome, you just shove hose in and when full water runs out over side of motorhome. City water is another place on side of motorhome and no valves at all involved
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Old 02-11-2014, 11:33 AM   #5
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Quote:
Originally Posted by thor ace View Post
fresh water has separate place on side of motorhome, you just shove hose in and when full water runs out over side of motorhome. City water is another place on side of motorhome and no valves at all involved
Obviously, the "city water" is being added to your tank somehow.....probably thru the pump, as suggested above.

Try posting your situation in the THOR owner's forum here on iRV2. I'm betting you aren't the first to have this issue.
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Old 02-11-2014, 11:33 AM   #6
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Since the whole county has been colder than normal, have you been exposed to freezing temps? One thought that I am hoping is very wrong is that the water in the tank is starting to freeze, and the expansion is pushing water out of the full tank. Again, hoping that I am wrong.

EDIT: I would also agree with edgray. If the water in the tank is not freezing, then the pressure of the city water is somehow pushing backwards past your fresh water pump, and into the fresh water tank (?check valve?).
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Old 02-11-2014, 12:09 PM   #7
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fresh water has separate place on side of motorhome, you just shove hose in and when full water runs out over side of motorhome. City water is another place on side of motorhome and no valves at all involved
Well, I guess you sure schooled us!

Actually there is a valve that allows you to fill your fresh tank while hooked to city water. Look on page 82 of your manual. It is probably partially in the "fresh tank" position or it is broken. if neither of those, then the check valve on your water pump may be bad or stuck.
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Old 02-11-2014, 03:14 PM   #8
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....Actually there is a valve that allows you to fill your fresh tank while hooked to city water....
That's the way mine works. One position is for shore water, the other position is to fill the tank while hooked to shore water.
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Old 02-11-2014, 03:32 PM   #9
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I'm aware that things change, but the OP's description of filling the FW tank was on the mark for my 2012 Thor Hurricane 32A. The only way to fill the FW tank was via the fill spot on the side of the motorhome (it wasn't even behind a door, just a screw on cap). City water was also not in a bay, but another receptacle on the side of the motorhome a little ways below the gravity fill. It was always either-or, but not both. There probably was a check valve where the FW tank line met the city water fill line, but that area was located in a wall cavity that had to be accessed through a false cabinet wall below the bathroom sink. While I may be wrong about the OPs filling method, my point is that this statement could have been accurate for a Thor just two years ago.
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Old 02-11-2014, 04:32 PM   #10
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I'm aware that things change, but the OP's description of filling the FW tank was on the mark for my 2012 Thor Hurricane 32A. The only way to fill the FW tank was via the fill spot on the side of the motorhome (it wasn't even behind a door, just a screw on cap). City water was also not in a bay, but another receptacle on the side of the motorhome a little ways below the gravity fill. It was always either-or, but not both. There probably was a check valve where the FW tank line met the city water fill line, but that area was located in a wall cavity that had to be accessed through a false cabinet wall below the bathroom sink. While I may be wrong about the OPs filling method, my point is that this statement could have been accurate for a Thor just two years ago.
Well, truth is of course that without being there and looking at it, I cannot speak with complete authority but the 2013 manual does list the valve. It could be an option.

That unfortunately would have been the best possible cause.
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Old 02-11-2014, 04:36 PM   #11
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Two suspects: As noted above many RVs have a Quick Fill valve (that is the brand name of one of 'em) this is a valve usually on the service side of the motor home near the water inlet, that lets you fill the fresh tank from the city water inlet.. It may be a 3-way valve and if it is not fully seated it can do that...

The other suspect is the water pump check valves.

There is no suspect #3.
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Old 03-30-2014, 12:35 PM   #12
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update, thanks all for your answers. took unit into camping world and water pump was the problem. new water pump installed and no problems since. tks again for answering.
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Old 03-30-2014, 01:32 PM   #13
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Always good to hear what the problem was...thanks for the update.
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Old 03-30-2014, 05:28 PM   #14
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I would guess I have the same water pump as you. I had the same problem with my fresh water tank filling slowly while connected to city water. It happened twice this winter. I turned off the city water and ran off the water pump. It was obvious it was the check valve in the water pump because the pump would momentarly come on every few minutes to maintain pressure. I just ran the water pump for about 10 minutes and the leak down of pressure stopped. It was probably just a little obstruction keeping the valve from closing all the way. I ran off the pump for a few days to drain down the water tank. Now every couple of weeks I fill the tank and run the water pump for a day or so . No re-occurrence of the problem. Like most of the systems in our RV's it's best to exercise the machine rather than leave it dormant.
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