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Old 08-19-2015, 01:05 PM   #1
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Fresh water runs out rear drain hose

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
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Old 08-19-2015, 01:13 PM   #2
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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.
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Old 08-19-2015, 01:16 PM   #3
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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.
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Old 08-19-2015, 11:36 PM   #4
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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.
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Old 08-19-2015, 11:53 PM   #5
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You sure it's not the low-point drain? Just something to check...

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Old 08-20-2015, 08:58 AM   #6
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Low point drain is clearly marked and has an open an closed valve handle
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Old 08-20-2015, 09:22 AM   #7
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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.
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Old 08-20-2015, 10:19 PM   #8
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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.
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Old 08-20-2015, 10:29 PM   #9
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Quote:
Originally Posted by MOCamper View Post
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! :-)

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Old 08-20-2015, 11:41 PM   #10
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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.
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