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Old 06-05-2016, 08:15 PM   #1
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Fresh water tank empties while driving

Has anyone had an issue with the fresh water tank sloshing out overflow? Never had this problem before. Filled tank full, after driving through switch backs in Mountains water tank was empty. No leaks but I discovered it coming out of overflow on turns etc. Strange??
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Old 06-05-2016, 08:20 PM   #2
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Common problem on these trailers. I put a cap on mine to close them off during travel.
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Old 06-05-2016, 08:38 PM   #3
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This thread should give you plenty of reading entertainment.
Bottom line, most people(myself included) end up adding a couple of shutoff valves to their tanks. A few people have extended the tubing above the tank level in a loop.
This is a irritating design flaw that has been going on for years.
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Old 06-05-2016, 08:38 PM   #4
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Originally Posted by DanNJanice View Post
This thread should give you plenty of reading entertainment.
Bottom line, most people(myself included) end up adding a couple of shutoff valves to their tanks. A few people have extended the tubing above the tank level in a loop.
This is a irritating design flaw that has been going on for years.
Linky https://www.jaycoowners.com/forums/f7...ukes-3503.html
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Old 06-05-2016, 10:03 PM   #5
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Originally Posted by clubhouse View Post
Common problem on these trailers. I put a cap on mine to close them off during travel.
^ what he said. I used a couple of rubber corks from Ace Hardware.
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Old 06-07-2016, 04:48 PM   #6
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Thank you

Tnx for replies, I was hoping I wasn't the only one. I used 3 AA batteries and plugged each tube... result...no water loss since. When we get back I will do the valves. Thanks again
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Old 06-07-2016, 05:06 PM   #7
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Tnx for replies, I was hoping I wasn't the only one. I used 3 AA batteries and plugged each tube... result...no water loss since. When we get back I will do the valves. Thanks again


I used these from Home Depot, cheap and they fit so tight I really did not need the hose clamps that I used. http://www.homedepot.com/p/Rain-Bird...0-1S/204751239



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Old 06-09-2016, 11:46 AM   #8
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Thumbs down

Only happened once, so far, siphoned 1/2 of a full tank from the overflow when leaving for a trip. All the way down the road a water trail, really upset me, thought it was a broken tank.
Not sure where I would add a 'shut off valve'. If it has to be on the overflow, it's not happening, that's a long dirty crawl under the RV.
Or where to add AA batteries, in the cold water line somewhere?
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Old 06-09-2016, 11:54 AM   #9
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Only happened once, so far, siphoned 1/2 of a full tank from the overflow when leaving for a trip. All the way down the road a water trail, really upset me, thought it was a broken tank.
Not sure where I would add a 'shut off valve'. If it has to be on the overflow, it's not happening, that's a long dirty crawl under the RV.
Or where to add AA batteries, in the cold water line somewhere?
You could do the crawl one time and extend the line down to where you can reach it. Then you could 'put a cork in it.' Our procedure is, when we leave, the cork(s) go in and when we stop the cork(s) come out. Or you could install a valve you can reach.
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Old 06-09-2016, 11:59 AM   #10
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A thought was to install an additional outside valve like the black low point drain on our Greyhawk. Could operate without diving under MH (to turn of valve or un-cork) and clearly see open/closed setting upon prep/setup.
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