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Old 05-02-2016, 07:34 PM   #1
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Question, this weekend, filled the water tank on 5ver for first time, I filled it full according to tank level readout,and there was water running out of a line near the back of trailer underneath, even filled the lines and made sure hot water heater was full, drove to campground ,90 mi. While parking at campground noticed more water was coming from same line as before, when I checked tank level it was down to 1/3 of a tank? This is not the low point drain it's on opposite side of trailer near the back. There are 2 lines coming out in the same spot one just cut off and open, the other has about a 1/2" male thread plastic fitting and also open, any suggestions?
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Old 05-02-2016, 07:41 PM   #2
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If it's under the water tank, it's probably the tank drain.
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Old 05-02-2016, 07:50 PM   #3
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So it should have a cap on it?
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Old 05-02-2016, 07:51 PM   #4
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I would think the line without the threads would be a vent. The line with the threads should be a fresh water tank drain or a low point drain. The threaded line should have a cap or shut off valve put on it I would think. Which line was the water coming out?
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Old 05-02-2016, 07:52 PM   #5
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Yes. Mine has a cap, some have 1/4 turn valves.
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Old 05-02-2016, 07:56 PM   #6
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And, how do you know when tank is full?
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Old 05-02-2016, 07:57 PM   #7
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Good idea on the valve!
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Old 05-02-2016, 07:58 PM   #8
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It will back out the fill tube and also the breather. Which should be right along side the fill tube.
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Old 05-02-2016, 11:00 PM   #9
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Quote:
Originally Posted by billinmi View Post
And, how do you know when tank is full?
The tank gauge should be reading full, plus the water would begin to come out of the fill connection...
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Old 05-03-2016, 11:08 AM   #10
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On my last trailer if I filled the tank too quickly and didn't let the air burp out the vents, water would start to come out the vents. Once it starts a siphon, it can drain a whole lot of water back out instead of venting.

I added a gate valve to the end of my garden hose so I could stop it after every 20 gallons or so and listen to the venting and make sure I wasn't filling too quickly.
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Old 05-03-2016, 11:12 AM   #11
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On my last trailer if I filled the tank too quickly and didn't let the air burp out the vents, water would start to come out the vents. Once it starts a siphon, it can drain a whole lot of water back out instead of venting.

I added a gate valve to the end of my garden hose so I could stop it after every 20 gallons or so and listen to the venting and make sure I wasn't filling too quickly.
Interesting. I wasn't even thinking about venting...ill have to rethink my filling of the fresh water. I generally only keep some in there for use on road, but filled it a couple times last week to flush well. Maybe I will pause every so often while filling.
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Old 05-03-2016, 11:32 AM   #12
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Next to your fresh water fill port there's a small screen about 1/2" diameter, that's where it was suppose to vent, but since they started putting everything inside a convenience center they didn't want too much water in there so they started dangling the vent out the bottom thus creating the siphon. If you can get to your vent line you could add more hose to it with a loop in it & raise it higher or you could hook it to its original spot & not overfill too much.
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