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Old 01-19-2015, 08:59 PM   #1
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Losing water while traveling

I have an interesting issue that I haven't seen discussed much. I am losing water when I travel in my MH. The vent/overflow tubes allow water to spill out when turning corners or getting bounced around by wind or road. I always am sure to fill the tank fully when I'm planning on boondocking and by the time I arrive to my destination, I'll be down 15-25 gallons!

I've toyed with the idea of putting 1-way or manual valves on the vent tubes, but I'm wondering if someone has a better solution? The water isn't siphoning out (like I've seen with other rigs) as the tubes terminate at the top of the tank. I've seen it flow out while parked on an incline or turning corners though.

Any help or ideas is appreciated!

Tim, Tara and Canyon - 'TnT' (& C now...)
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Old 01-19-2015, 09:09 PM   #2
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I know on one of our first voyages we left the valve turned to local supply and all our water drained out. Handle has to be on holding tank

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Old 01-20-2015, 08:26 AM   #3
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My MH when new did the same thing. Vent tubes are also at the top of the tank but when turning and a flow starts it does siphon until below the fittings, or until the next turn or slosh...
Fix was make a complete loop in the vent hoses with the top of the loop higher than the tank. Completely eliminated the problem. FWIW another problem occurrs, if one loop is full of water and the others have only a small amount, that tank will not drain in normal use until the 1st tank is very low....
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Old 01-20-2015, 01:07 PM   #4
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Ours did that the first trip out, what I did was to fill the tank just below full. That way when it sloshes around it does not start siphoning out. I'm only talking about an inch or so below full should do the trick, and you will still have plenty of water to dry camp.
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Old 01-20-2015, 04:15 PM   #5
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I put a ball valve on my overflow tube. Opened it when filling the tank. Closed it afterward. Worked perfect for three years.
Jack Robnett Lubbock, Tx
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Old 01-25-2015, 08:42 PM   #6
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Our MH does that when I top-off the fresh water tank. I remember last summer in Newfoundland, I was climbing about a 12% grade just after leaving a CG. I left a trail of water all the way up the mountain. At first I began to panic, seeing a trail of water in my rear-view mirror is unsettling to say the least. When the coolant temp gage didn't move hotter I began to relax a bit. That's when I noticed the MH in front of me leaving a water trail too.

jrobnet. I would have thought using your water pump pulls a vacuum in your tank until it stops working, with no open vent.
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Old 01-26-2015, 08:38 AM   #7
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My MH did that too. The vent tube went from the top of the tank then down so anytime the water hit that point the water ran out. The down tube was 12" long so I turned it up and put 2 90's on it with a new 24" tube down from there. No more spilling. A vent should always be open.
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Old 01-26-2015, 08:45 AM   #8
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I have the same issue with my 2000 30Q. Seem the fill hole and where the tube connects with the tank are at the same level and it is a straight tube. Most of the water seems to be coming from the gravity fill and not the vent tube. It would help I suspect if they would but a rubber washer on the cap.

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