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Old 07-11-2017, 11:05 PM   #1
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Fresh tank overfilling

On a 30 day trip now and when I leave the RV for extended periods of time I always turn off the water. Today I came back turned it on used water inside and went on doing other things. When I came outside I found water pouring out of the bottom of the docking station, looked inside & found water coming out of the fresh water fill. Freshwater tank was half-full before I got to my campground, now the tank is so full it's flowing out of the fill. Why is this happening? Need advice.....

Unit is a 2016 Prine Time Crusader 296BHS
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Old 07-12-2017, 07:55 AM   #2
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Water is coming out of my fresh water fill
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Old 07-12-2017, 07:57 AM   #3
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The back flow valve in the water pump is not seated properly.
Shut off public water.
Run water in unit until it stops ( no pressure in system)
Turn on water pump a
open a faucet and run water for a minute or two.
Close faucet and shut off water pump
turn public water back on


This should re-seat the back flow valve. It is best not to ever leave water pump on when connected to public water.
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Old 07-12-2017, 07:59 AM   #4
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Yes it was pouring out of the freshwater feel tank were the cap screws in. Tank meter inside shows full when I had 1/3 in the tank.
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Old 07-12-2017, 09:23 AM   #5
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Hi,

Just a guess here, but couldn't this present a particular hazard when a rig has a direct hose connection for filling a tank -- not an open port for dumping water in for filling?

That's because the overflow tube from the fresh water tank is much smaller -- and with less capacity -- than the input from the hose filling the tank. A valve stuck in this manner could pressurize the fresh water tank and cause it to bulge.

Just asking...

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Old 07-12-2017, 09:41 AM   #6
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Hi,

Just a guess here, but couldn't this present a particular hazard when a rig has a direct hose connection for filling a tank -- not an open port for dumping water in for filling?

That's because the overflow tube from the fresh water tank is much smaller -- and with less capacity -- than the input from the hose filling the tank. A valve stuck in this manner could pressurize the fresh water tank and cause it to bulge.

Just asking...

Rich Phillips
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Old 07-12-2017, 04:35 PM   #7
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Drained a bit out of the tank shows 3/4 full hasn't happened again. I leave both gray valves open, black tank closed, and turn off the water when I leave the RV. All I did yesterday is come back turn the water on and went about my business no idea what would cause the tank to fill up to the point it overflows out of the gravity fill cap. Must be some kind of switch mechanism or something.
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Old 07-12-2017, 04:37 PM   #8
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Drained a bit out of the tank shows 3/4 full hasn't happened again. I leave both gray valves open, black tank closed, and turn off the water when I leave the RV. All I did yesterday is come back turn the water on and went about my business no idea what would cause the tank to fill up to the point it overflows out of the gravity fill cap. Must be some kind of switch mechanism or something.
Did you read flybob's post #3?
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Old 07-12-2017, 04:41 PM   #9
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Did you read flybob's post #3?
Oops no I'm on this iPhone miss my PC will go back & read, thanks.
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Old 07-12-2017, 05:17 PM   #10
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Originally Posted by richp View Post
Hi,

Just a guess here, but couldn't this present a particular hazard when a rig has a direct hose connection for filling a tank -- not an open port for dumping water in for filling?

That's because the overflow tube from the fresh water tank is much smaller -- and with less capacity -- than the input from the hose filling the tank. A valve stuck in this manner could pressurize the fresh water tank and cause it to bulge.

Just asking...

Rich Phillips
I can dang sure guarantee that's right! Do not ask me how I know!
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