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Old 05-13-2015, 05:25 PM   #1
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Stopping fresh water loss when traveling

Filled the FW tank for my first boondocking trip and when I got there it was down to 1/3 full. I figured out it must of came out the relief/overfill valve due to the driving because I couldn't find any leaks. What's the best way to stop this?
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Old 05-13-2015, 05:31 PM   #2
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Filled the FW tank for my first boondocking trip and when I got there it was down to 1/3 full. I figured out it must of came out the relief/overfill valve due to the driving because I couldn't find any leaks. What's the best way to stop this?
Duct tape over it or if it doesn't have a screen over it, a plug of some kind.
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Old 05-13-2015, 05:46 PM   #3
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we added a shutoff valve to ours, just gotta remember to open it when filling
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Old 05-14-2015, 09:59 AM   #4
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It's not really an overflow but a vent that's routed in the wrong direction and causes water to siphon out. Our RK has this and you can simply rout the end of the tube upward, higher than the top of the tank and it won't do that anymore.
Or as jawga suggests, a shut off valve works but you have to remember to turn it on and off.
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Old 05-14-2015, 01:25 PM   #5
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I had the same problem a couple of times in my 2011 Georgetown 327. My solution was to not quite fill the water tank.

The overflow for my fresh water tank rises at least 1" above the tank before heading out the bottom of the compartment. For this siphon effect to work, the overflow pipe probably extends down into the tank, a design feature I don't understand.

Phil
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Old 05-14-2015, 02:01 PM   #6
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Same problem with my '05 Georgetown.

Put a valve on the end of the vent pipe and it worked great until DW flushed the toilet with the valve closed. Collapsed the tank. Expensive repair. Now we have a sticky note on the pump switch.

Bill
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Old 05-14-2015, 02:14 PM   #7
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Same problem with my '05 Georgetown.

Put a valve on the end of the vent pipe and it worked great until DW flushed the toilet with the valve closed. Collapsed the tank. Expensive repair. Now we have a sticky note on the pump switch.

Bill
Funny how atmospheric pressure works. Have you ever seen the video of a railroad tank car collapsing when a valve was not opened to the atmosphere. Many a semi tank truck has had that happen also. I would be careful to avoid putting a valve on the vent. Stuff happens when you forget.
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Old 05-14-2015, 03:33 PM   #8
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Fresh water tank

Are you sure it was full. Some tanks or fill lines get a air lock and will burp out the fill point when its not full. Filling slowly will normally overcome this problem. My 5r has the vent routed to the fill point so I don't have the problem but my son in law does and the slow fill works.
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Old 05-14-2015, 04:38 PM   #9
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Had the same experience with my 2005 Cedar Creek. The dummies at Forest River shoved the overflow line into the tank too far and when the RV was in motion it started a siphon effect which almost drained my tank (on numerous occasions).
The solution was to drop the tank, relocate the overflow tube to the proper height and re-install the tank with overflow tube attached to the vent nest to the fill tube. When FR initially installed the tube they just let in hang down which really made the siphoning easy to start.
I just wonder if manufacturers realize how PO)'d customers can get and how much repeat business they loose..........?
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Old 05-14-2015, 09:44 PM   #10
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I would be careful as to plugging or closing as pressure will build up. I had to relocate mine higher up on the tank as FW installed about 2/3 the way up. My previous units had a vent at the fill tube.
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