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Old 05-13-2015, 04:25 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, 04:31 PM   #2
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Originally Posted by Golfnbike13 View Post
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, 04:46 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, 08:59 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, 12:25 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, 01:01 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, 01:14 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, 02:33 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, 03:38 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, 08:44 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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Old 05-14-2015, 09:51 PM   #11
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I have the 195bh and the FW tank is inside under the bottom bunk bed. The overfill hose is at the top of the tank and just hangs straight down through the floor to the outside. In the photo it's the bottom one that goes straight into the pile of spray foam.
I can't see a simple solution other then putting a shut off valve on the end of hose, but I'm pretty forgetful so it sounds like that may be a bad idea?
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Old 05-16-2015, 10:26 AM   #12
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Having same issue with my Georgetown 34. Leaving for a dog show water ran out as I was going down my driveway, never happened before, drove back up, crabs the duck tape and clamp and fixed it. Just saw your reply, what type of valve did you get? Thanks
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Old 12-16-2015, 10:18 PM   #13
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Having same issue with my Georgetown 34. Leaving for a dog show water ran out as I was going down my driveway, never happened before, drove back up, crabs the duck tape and clamp and fixed it. Just saw your reply, what type of valve did you get? Thanks

I never got around to putting a valve on it because all my sites have had water hookup since. But I need to address this just wanting another option because I know I would forget to open the valve.


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Old 12-16-2015, 10:47 PM   #14
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Quite possible that this would be a cure:

Seachoice Aluminum Anti-Siphon Valve - Star Marine Depot

Lets air in, blocks liquid out.
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Old 12-16-2015, 11:51 PM   #15
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Another le fix would be to make the vent line longer and put a couple loops in it. Factories use to do this for gas tanks before they were sealed systems. Guys with old cars would know this.
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Old 12-17-2015, 04:44 AM   #16
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Quite possible that this would be a cure:

Seachoice Aluminum Anti-Siphon Valve - Star Marine Depot

Lets air in, blocks liquid out.
This valve would cause some Members Big problems as the Vent Hose MUST allow Air In and Out but also Check Water from going Out! Vent/Overflow tube Must be Open to prevent (2) conditions of the F/W Tank, (Imploding and Exploding)! Youroo!!
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Old 12-18-2015, 04:18 PM   #17
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This valve would cause some Members Big problems as the Vent Hose MUST allow Air In and Out but also Check Water from going Out! Vent/Overflow tube Must be Open to prevent (2) conditions of the F/W Tank, (Imploding and Exploding)! Youroo!!
Been there partially collapsed mine and broke the water hose. I used a simple plastic valve from Lowes but forgot to open at a rest area when DW flushed

Not a cheap fix. Bill
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Old 12-21-2015, 09:44 PM   #18
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So here's a photo of the inside of the gravity fill going to FW tank. It looks like there is a small place to the right for a tube hookup and there is a screen on the outside the factory covered with silicone. Could I just reroute the vent tube to this connection and remove that silicone?Click image for larger version

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Old 12-21-2015, 11:21 PM   #19
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That looks like mine except you don't have a hose attached. You can attach the vent there and that should cure your problem. With that hooked up, when you fill the tank, that is were the overflow will come out.
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Old 12-21-2015, 11:29 PM   #20
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That looks like mine except you don't have a hose attached. You can attach the vent there and that should cure your problem. With that hooked up, when you fill the tank, that is were the overflow will come out.

Why would they not set it up that way? Scroll up and see my vent line just goes straight down through the floor.


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