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Old 05-14-2013, 03:15 PM   #71
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I'm a little late on this thread, but I thought what I found out on my 2005 Jay Feather LGT was worth mentioning.

When we took delivery of it as a new camper in 2004, the vent/over flow hose went from the vent fitting on top of the tank directly around the side of the tank and out through the underbelly enclosure. The first time or two we used the camper, we lost a lot of water due to sloshing/siphoning out the vent hose.

Later I noticed on the water tank fill cap panel on the side of the camper, there appeared to be what I assumed to be a fitting for a vent hose with a barbed hose connector on the inside of the camper. Everything was accessible enough to where I was able to pull the vent hose back up from the under belly, cut off the excess length and connect it to the barbed hose connector on the water tank fill panel.

Now that the height of the vent relative to the tank was now much higher, my water loss went away.
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Old 05-16-2013, 08:19 AM   #72
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My vent hoses are to far under and behind the wheels to use hose clamp pliers and such. I decided to cut one of my 1/2 water hoses and use barbed connectors to extend them out to where I can reach them. Maybe about 3 feet. Then use 2 males garden hose replacement ends to attach to the other end and use a couple of screw caps on them. Hopefully we can get to our site with all 80 gallons next time
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Old 05-17-2013, 10:48 PM   #73
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I had the same issue - lost over 1/3 of my water over a 2.5 hour drive. Silly - and frustraing as we needed that water! I have a 55 gallon tank.

My overflows are about 5 inches long - so i cut off 1/2 inch of one and took it to the hardware store where I found a valve that fit. Bought 2 of them and now only open them when I'm filling so I know when I'm full.

Interestingly, when filling, if I just let it fill until they both run at "full bore", it will keep running after the water is turned off for several minutes. To me that confirms siphoning as the issue.

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Old 05-20-2013, 12:27 PM   #74
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Quote:
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Interestingly, when filling, if I just let it fill until they both run at "full bore", it will keep running after the water is turned off for several minutes. To me that confirms siphoning as the issue.

-Chak
Ours did the same thing. Even if i was level it just kept coming out. I extended my vents hoses 3 feet to right under where the fill cap is. I can reach the caps without getting on my hands and knees. Filled it until it came out of the fill hole and gauge indicates full with no leaking :hihi:
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Old 06-25-2015, 10:41 AM   #75
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2016 Models drain the same way

After reading this thread I can see the issues of siphoning the fresh water have
been going on for YEARS! Come on JAYCO, you must have Engineers that could design a fix for this. I've recently went on our first camp out with our new 29 RKS Jay Flight. About an hour and a half drive. I knew I filled at home before I left and when we got to the Park, I spent three days trying to figure out where I was pulling in air to the pump. All the symptoms showed, sputtering faucets etc. Never thought of checking the gauge for how much water I had because I put in 80 gallons at home. We used the park showers so I was SURE we had surplus water. BOY was I surprised to find out my tanks were empty! Since my hoses are located behind one of the TT wheels, I guess I'll join them to a hose running out to the edge of my trailer near the fresh water drains where I can see them and won't forget to open their valve on arrival at camp.
I've had a 2005 Jay Flight, a 2010 Super light Eagle Fifth wheel, and now a Jay Flight TT but never have I had such an obvious issue with siphoning.
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Old 06-25-2015, 12:45 PM   #76
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I know the solution for the air vent line puking all your water out, and Jayco could fix the issue with just a small amount of cost (~5 cents per unit, by extending the hose length). My vent hose extended down below the tank level, sounds reasonable. The peak of the vent tube unfortunately was only 5-8 above the floor height. I do not have an enclosed underbelly, so I pulled the hose up into the cabinet so only a small amount of hose is through the floor and now I have a high point in the loop about 16” above the floor. Since changing the vent tube height I have never had any puking or siphoning issues.
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Old 06-25-2015, 01:18 PM   #77
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Quote:
Originally Posted by Jagiven View Post
I know the solution for the air vent line puking all your water out, and Jayco could fix the issue with just a small amount of cost (~5 cents per unit, by extending the hose length). My vent hose extended down below the tank level, sounds reasonable. The peak of the vent tube unfortunately was only 5-8 above the floor height. I do not have an enclosed underbelly, so I pulled the hose up into the cabinet so only a small amount of hose is through the floor and now I have a high point in the loop about 16 above the floor. Since changing the vent tube height I have never had any puking or siphoning issues.
Excellent solution! I'd do the same, but my underbelly is enclosed.

Since you do not have an enclosed underbelly, can you see where the vent hose comes out of the water tank(s)? I suspect the vent exits the tank along one of the sides allowing water to slosh to that side and start the siphoning. If that is true, then another '~5 cent solution' with a longer hose might be for Jayco to have the vendor move the vent to the center of the tank.
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Old 06-25-2015, 11:59 PM   #78
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The vent tube comes out of the top of the tank next to the pickup hose for the pump.

I bet even on an enclosed underbelly, if they extended the hose to have a loop up higher up would help.
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Old 06-26-2015, 06:26 AM   #79
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Mine does the same so I added two shut off valves. I close them up to travel and open them up at the campsite.
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Old 04-28-2016, 01:36 PM   #80
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These fixes won't work for my 2013 248rbs. When I fill the tank, I get to 1/3 full and the overflow/vent tubes siphon the tank empty. Any ideas?
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