Fresh water runs out rear drain hose

[Brownlee]

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

[Iraqvet05]

Welcome to the forum! This seems to be a common issue with some TTs and there are a few threads about the issue on here. It appears a vacuum is created and the water will run out of the overflow tubes. Some have resorted to installing shut-off valves or plugs on the overflow tubes to resolve the issue.

[Bobx2]

Is it the tank drain, or is it coming out of the tank vent line? If it is coming out of the vent line, just find something to plug it with. Loosen the filler cap or remove the plug before using the pump. If it is coming out of the tank drain line, it needs to have a valve put on it.

[Brownlee]

I guess it is the vent line. It is a flat hose about 1 1/2 inch wide looks like a discharge hose. Put a valve in it that I can open and close, but now it comes out what I think is the overflow. Ms smaller hose looks the size of a garden hose.

[LAKnox]

You sure it's not the low-point drain? Just something to check...

Lyle

[Brownlee]

Low point drain is clearly marked and has an open an closed valve handle

[DanNJanice]

I have a similar issue on a 2015 27RLS. For the time being I have put a couple of shutoff valves (mine has two hoses out the bottom). As many others have done, I close the valves while traveling and open them for filling/use.
Mine starts spewing water at about the 2/3 full level. I measured it a couple days ago and I can get about 45-50 gallons into the tanks, where it was advertised as 80.
I suspect on mine the issue is caused because the vent lines are on the side, near the top of the tank. Rather than truly on top. Mine has a sealed underbelly, so I cannot confirm until I pull that off so I can see what is going on. Probably not until later this year.

[MOCamper]

When I was really active on this forum 4 years ago there was a thread that covered this. The solution was a Carlisle clamp that looked a lot like forceps.

[LAKnox]

Originally Posted by MOCamper

When I was really active on this forum 4 years ago there was a thread that covered this. The solution was a Carlisle clamp that looked a lot like forceps.

Woah, duuuuude! Dig out an old roach clip. Far out, man! :-)

Lyle

[ALJO]

I put the vent/overflow lines in a capped 1 1/2 capped abs pipe (18" above the tank)
No more problems of loosing water. But venting and overflow is still in place.
Was about 30 minute job.

[Brownlee]

Thanks but I have an enclosed under belly not sure how to expose water tank to make a fix.

[Scoutr2]

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.

[Jagiven]

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.

[dewey02]

Originally Posted by Brownlee

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?

[aubtig1979]

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

[mtdawg]

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.

Jim

[klassic]

My North Point does it for about 5 mins then stops.