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Old 09-13-2017, 12:34 PM   #1
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Fresh Water Overflow Mod

Well I finally got around to modifying the fresh water overflow hose on my 2015 Ventana 4037.

Whenever I fill it up, by the time I pull the unit out into the street and get the Jeep hooked up, I've lost 1/3 of the water in the tank.

I read somewhere on IRV2 about extending the overflow hose and finally got to it today. The job itself it simple. Removing/Replacing the pegboard and aluminum angle iron is a bigger pain than it should be.

I'll find out tomorrow if it works when we head out to the Hershey Show.

I bought the tubing here:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Attached are pictures of the routing of the tubing and the job all buttoned back up.
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Old 09-13-2017, 12:53 PM   #2
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Unfortunately most who've done the mod , had to raise the brass tank vent too; to prevent it leaking instead of the over flow .
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Old 09-13-2017, 12:54 PM   #3
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Much like I had Newmar do last month under warranty. I have not had a problem with siphon issues since.
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Old 09-13-2017, 12:56 PM   #4
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Quote:
Originally Posted by Skip426 View Post
Unfortunately most who've done the mod , had to raise the brass tank vent too; to prevent it leaking instead of the over flow .
Interesting, why would water exit the air admittance valve? It really shouldn't be able to flow in that direction.
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Old 09-13-2017, 01:33 PM   #5
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I haven't had the issue myself ; just going by posts from other Newmar owners.

http://www.irv2.com/forums/f103/fres...ak-337724.html
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Old 09-13-2017, 01:41 PM   #6
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Quote:
Originally Posted by Skip426 View Post
I haven't had the issue myself ; just going by posts from other Newmar owners.

http://www.irv2.com/forums/f103/fres...ak-337724.html

Well, it will be obvious tomorrow.

I'll update my experiences.
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Old 09-13-2017, 01:58 PM   #7
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Quote:
Originally Posted by ewlee View Post
Much like I had Newmar do last month under warranty. I have not had a problem with siphon issues since.
Did you have to raise the air admittance valve too?
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Old 09-13-2017, 02:04 PM   #8
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I don't suppose you have a photo of what it looked like before the mod? Thanks
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Old 09-13-2017, 02:40 PM   #9
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Newmaepusher
I don't suppose you have a photo of what it looked like before the mod? Thanks
I forgot to snap a photo. But here is someone else's that the overflow hose looked similar to the routing of mine.

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Old 09-13-2017, 04:20 PM   #10
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Fresh Water Overflow Mod

I had the issue of the brass AAV leaking. Here is a picture of my full modification. Note that I also added a siphon breaking pin hole in the accordion overflow tube just past the loop over. Note also my SeaLevel gauge sensors. Click image for larger version

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Old 09-13-2017, 04:29 PM   #11
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Quote:
Originally Posted by newmarpusher View Post
Did you have to raise the air admittance valve too?
No, they did not raise the AAV. When the tech tested the new routing, he overfilled the tank and there was not an issue with water coming out of the AAV. I don't know what your coach has but mine has an auto fill on the tank so it normally stops lower than what he filled it to.
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Old 09-13-2017, 04:51 PM   #12
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I did not try this on my last rig but will on the new one in the next day or so. If you drill a small hole at the top of the overflow tube, it will suck air and won't be able to siphon right? These other solutions look complicated.
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Old 09-13-2017, 05:05 PM   #13
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I did not try this on my last rig but will on the new one in the next day or so. If you drill a small hole at the top of the overflow tube, it will suck air and won't be able to siphon right? These other solutions look complicated.
The overflow tube is there to relieve excess water outside the coach instead of inside the coach, which IMHO, is what a small hole in the tube will do for you.
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Old 09-13-2017, 05:09 PM   #14
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Quote:
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The overflow tube is there to relieve excess water outside the coach instead of inside the coach, which IMHO, is what a small hole in the tube will do for you.
I knew someone would say that. How much water do you suppose? I'm talking about a pin hole. Anyway, I'm gonna try it. If it floods the compartment I'll have egg on my face for sure. I'm a risk taker!
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