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Old 10-26-2013, 10:20 PM   #1
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Water Tank fills fine, then half drains out on the road

I have 1993 Coachmen. I fill the water tank until water starts to come out both of the drain tubes under the coach. I shut off the supply water and the water stops draining out the tubes in less than a minute, but as I go down the road I leave a steady stream behind me. I don't stop losing water until the tank is around half full. I've looked at the tank and there are two lines coming out the top of the tank and going straight down through the floor under the tank. These are the lines that have water coming out when I fill the tank. I guessing since I don't see any other lines on the top of the tank that one is the vent and the other is the overflow, but I don't understand why they both go down through the floor under the tank. The unit does not have a vent on the side of the coach where the water line attaches. I also suspect that this is not the original Coachmen water tank system. Any thoughts on how I can keep from losing half my water in the first few minutes after I fill?

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Old 10-28-2013, 12:19 AM   #2
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I have the same thing with my Vcross. I know it is the overflow tube doing it. There are no baffles in the tank and no baffle near the tube evidently, so the water sneaks out. I prefer not to travel with a full tank on the road, because I don't have trouble filling up when needed, and I don't care for the weight of a full tank. in the boonies, I carry a 30 or 55 gal drum or both in m y pick up bed, which I can fill before getting lost in the woods or desert. I can also make a water run without the trailer.

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Old 10-28-2013, 12:30 AM   #3
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sounds like your low-point drains are still open.
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Old 10-28-2013, 12:38 AM   #4
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No, just the overflow. I learned about overflows from my gravity feed extra diesel fuel tank. Just the sloshing around will allow a few gallons of diesel through the unbaffled air/overflow vent to drain into my main tank.
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drain, tank, water, water tank

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