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Old 05-14-2007, 08:20 PM   #1
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I find in the 2005 Adventurer, when I fill the fresh water, and drive, almost a third of the tank overflows, it appears to overspill through the overfill line above the right rear jack. I was thinking of putting a shut off valve on the line to prevent spillage when driving...naturally I would leave the valve open when filling. It's only a problem the few times we dry camp, since we reach the campground with less than full water. Any ideas. Thanks.
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Old 05-14-2007, 08:20 PM   #2
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I find in the 2005 Adventurer, when I fill the fresh water, and drive, almost a third of the tank overflows, it appears to overspill through the overfill line above the right rear jack. I was thinking of putting a shut off valve on the line to prevent spillage when driving...naturally I would leave the valve open when filling. It's only a problem the few times we dry camp, since we reach the campground with less than full water. Any ideas. Thanks.
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Old 05-14-2007, 09:03 PM   #3
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My gut feeling is there is a siphoning effect going on for some reason, The tube sould have to to be 1/3 of the way into the tank and hang down 1/3 of the way on the outside of the tank. I don't know the design details though so maybe someone else who knows the inside of the tanks could tell us more.

One possible solution is if the tube is hanging down lower than the top of the tank then maybe you could tie-wrap to raise it so it's nearly flush with the top of the tank.
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Old 05-15-2007, 02:56 PM   #4
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The tube is of the hard plastic variety and you can't tie it up. What I do on mine is fill it until it starts dripping out of the overflow, then stop filling and let it spill out until it stops dripping. Then I top it off again and the tank stays full, don't loose any on the road.

I think when the tank is filled from the right side fill port, it doesn't have a very big vent area and the incoming water slightly pressurizes the tank. The vent is actually the overflow drain tube. By letting it bleed off water thru the overflow and dropping the pressure, I am able to top off the tank with no problem.

I'd guess you don't have this issue if you fill the tank thru the city water fill in the wet bay instead of the right side fill because it fills slower.

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Old 05-16-2007, 03:34 AM   #5
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Because the tank is only about 6 inches high water can easily slosh or run out of the tank if the motor home leans enough.

I don't see how it can siphon because the overflow tube is on the top of the tank and does not extend down into the tank.

When I complained about losing water to the tech while having some warranty work done at the factory in Forrest City, he disconnected the overflow tube and added a loop that extends up a few inches above the top of the tank and then back down.
This prevents the water from running out of the tank when the tank/coach leans or the water sloshes around.
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Old 05-18-2007, 09:21 AM   #6
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I had the same problem in my rig. I bought a valve similar to one of the ones that are used to drain the water lines by the water heater. I installed it on the overflow line as it headed out the bottom of the rig. I also put a sticker in the door where I fill the tank to remind me to open the valve when filling and to close it before leaving for a trip.
I bought the valve from my local Winnabego service center.
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Old 05-18-2007, 09:42 AM   #7
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Throw this into your thoughts and tell me what you think. I usually fill the tank with the city inlet connection. I never seemed to lose any water while traveling that way. Then I read someplace that the tank will fill quicker if you open up the gravity fill door to let air excape while you fill it thru the city hookup.
Now since I do that, I seem to lose water out thru that gravity door while traveling. Not thru the overflow but thru the gravity door itself. The side of my coach is wet there by that door. I wonder if I have taken the air out of the tank with the gravity door open, filled the tank with water and now the water can run up that gravity fill hose whenever I make sharp turns or whatever. But before I used to open that door, it kept the tank "pressurized" and the water couldnt run up the gravity fill hose?
Think that makes any sense?
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Old 05-18-2007, 02:03 PM   #8
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I had the same problem. I actually have 2 large tanks that are hooked together and are shallow (about 6 inches tall) and I uaually lost at least 1/4 if not 1/3 of my water simply by braking. Did exactly as Scubadilo did. Now I get to keep all my water. I installed my valve in the bay instead of underneath and just have to open it back up when I set up camp. Problem solved.
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