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Old 05-04-2014, 12:06 PM   #11
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I had to put in a vacuum break in mine as it would siphon most of the water out. Dealer said it was damaging some of the tanks. Now just fill until it runs out of the over flow, then shut off!
What/Where/How...vacuum break.
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Old 05-04-2014, 12:12 PM   #12
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Have you throttled down on the water hose. I use a butterfly shutoff and let her trickle in. Or you could time it?
It's hard to time it because the tank does not always contain the same amount of water. That along with different GPMs coming out of the hose. I would hate to have to trickle it since most of the times there are other campers waiting to fill also.

What I plan on doing is open the door, hook up and fill, and when it's close to full go around ands shut if off. Last time we filled I had DS looking through the port hole with a flash light.
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Old 05-04-2014, 01:29 PM   #13
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I put a tee in the over flow and ran a line up from the tee. I reduced the line up to 1/2 inch, it just has to break the vacuum. It was recommend by the dealer, he said they were replacing tanks on our model because of damage to the tank from this problem. It would siphon half of the fresh water out before it stoped.
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Old 05-04-2014, 01:31 PM   #14
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I have a 350 ts, it was made in June 2011, but it is a 2012. I don't think all models had this problem.
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Old 05-04-2014, 05:44 PM   #15
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I put a tee in the over flow and ran a line up from the tee. I reduced the line up to 1/2 inch, it just has to break the vacuum. It was recommend by the dealer, he said they were replacing tanks on our model because of damage to the tank from this problem. It would siphon half of the fresh water out before it stoped.
Sorry, I'm more of a visual kind of guy. Is this what you did?

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Old 05-04-2014, 11:02 PM   #16
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Yup that is it. The 1/2 inch is taller than your drawing.
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Old 05-05-2014, 07:10 AM   #17
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Yup that is it. The 1/2 inch is taller than your drawing.
Were you able to put some sort of screen on the end of the top vent?
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Old 05-05-2014, 07:59 AM   #18
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Is it a vacuum breaker or just a backflow prevent valve? Seems to me that either will prevent venting as the holding tank water level decreases and that may or may not tend to damage the tank. Just a thought.
Didn't understand your post. Thought you inserted a valve. Looks like a simple solution to an ongoing issue.
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Old 05-31-2014, 06:52 PM   #19
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I did not put a screen but I think it is a good idea.
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