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Old 08-21-2015, 09:44 AM   #11
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Thanks but I have an enclosed under belly not sure how to expose water tank to make a fix.

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Old 08-21-2015, 09:53 AM   #12
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I've seen that on my trailer once. I overfilled the tank and water started running out the overflow tube. When I stopped filling, it continued to drain. At first, I figured "no problem." But it continued for quite some time. I used my air compressor to squirt a little air back up into the tube and then it stopped. My conclusion was that by overfilling, I had started a siphoning process, which the blast of air stopped.

A valve on the end would solve the problem, but if you ever forget to open it there could be repercussions - flooding inside your trailer, perhaps.


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2015 Jay Flight 32RLDS Elite
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Old 08-21-2015, 10:11 AM   #13
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I bet your overflow setup is a bit different than mine. As I have a 1/2" hose. Ours goes loops into the pump cabinet in the HTT. If yours does, extended the hose up higher, and this stopped our siphoning issue.

What I do not like about putting a cap on the overflow/vent, is when you are filling the tank, you must remember to open the vent line.
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Old 08-21-2015, 10:27 AM   #14
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Originally Posted by Brownlee View Post
Do lots of dry camping. When I fill my fresh waster tank and take off down the road, within 30 miles my tank is empty runs out the drain hose(s) at the rear of the trailer. Trailer is a 2015 jayco 27.5 rlts 6 months old. Help
This problem gets raised at least once every week or two for the past 5 years.
Why don't the moderators find the threads that have the best answers and post them as a sticky?
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Old 11-01-2015, 07:59 PM   #15
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Mine is a 2015 MH 31 ft Greyhawk, When I added 12 gallons of water, there is a small tide directing downward near the grey/ black tank openings that water was exiting from. Is that the vent or overflow, we plugged it , everything seemed ok, but we only put 1/3 of tank in...thx
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Old 11-02-2015, 11:17 AM   #16
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I had the same problem on my 2013 28.5 RKS. The valves on the hose solved the problem, although as has been mentioned, once you close the valves do NOT put any more water in the tank(s) or you may rupture them voiding your warranty.

My brother in law had the same problem with his 2011 Jayflight.

My frustration with this is that when I contacted the service department, the guy acted as though they'd never heard of this problem. I'm pretty sure that if I, in Montana and my brother in law in Seattle had this problem on two different models, others did. I just felt as though the guy was less than honest with me.

Ultimately I traded in the unit on a 2016 North Point. Won't be able to use it until Spring. I'll be anxious to see if the problem still exists.

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Old 11-02-2015, 11:22 AM   #17
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My North Point does it for about 5 mins then stops.

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