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Old 10-06-2015, 05:13 PM   #1
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Fresh water leaking out tank

I have a small hose coming out of the insulation around my fresh water tank. It was intermittently leaking water this weekend on the road. Is it an overflow? I did not fill the tanks but they register full inside. I was hooked to city water in the campground this weekend.
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Old 10-06-2015, 06:18 PM   #2
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Probably the overflow hose. If you filled the water tank before the trip, it will splash some out the overflow.
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Old 10-06-2015, 06:25 PM   #3
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I'm not sure what that small hose might be. Perhaps its some sort of breather tube for the fresh water tank. In any case, I'm not sure what the cause of your intermittent leak might be, but I'll describe a problem I had that "might" apply.

I was in an rv park hooked to city water for a number of weeks, and was putting no water at all in my tank. However, one day I noticed water coming out the fresh water filler on the side of my trailer. The tank was full and clearly overflowing, despite the fact that I'd put no water in it. The problem turned out to be a faulty check valve in my water pump. Replacing the water pump corrected the problem.

Again, this may not be your problem, but maybe a possibility?
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Old 10-07-2015, 10:24 PM   #4
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I assume that the hose is protruding down from the under belly --- blue PEX tubing with either a cap or a valve on the end?? I think it's the drain for your fresh water tank.

I think that Nortie has ID'd the problem --------
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Old 10-07-2015, 11:06 PM   #5
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I agree, probably a check valve malfunction. There is no cap on this white tube. It's not really causing a problem right now. Will fix after our last trip which is next week.
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Old 10-08-2015, 01:50 AM   #6
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Newer trailers are coming with the fresh water tank vent tube coming out of the insulation, usually next to the drain for the tank, On older campers the vent was part of the fill tube, the vent is there but no hose connected between there and the tank. I put a valve on mine so it does not siphon out while driving down the road, I lost about a 1/2 a tank 1 time then I ran out of water camping. You just need to remember to turn the valve once you get parked to allow air back in the tank.
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Old 10-08-2015, 01:07 PM   #7
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If you put a valve on the vent pipe and forget to open it before using the water you can collapse the tank, not good. Many semi tank truck drivers learned that lesson the hard (expensive) way.
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Old 10-08-2015, 02:14 PM   #8
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Been 3 years, have not forgotten yet. It is part of my setup routine
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Old 10-08-2015, 04:05 PM   #9
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Your fresh water tank may have filled because of a stuck check valve on your water pump allowing city water to flow back into the fresh water tank. I had this happen earlier this year, ran the water pump for about 5 minutes cleared out what ever was holding the valve open. Just in case I had the problem again, I bought a check valve to put on the water put outlet.
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