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Old 10-23-2020, 11:14 AM   #1
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Question Fresh water overflow and beyond

I was filling up my fresh water and it got to overflow and beyond. Is there a separate overflow tank system or is it just a hose from the top of the tank to the overflow pipe? The floor of the peg board is wet and water was coming out from under the coach from the passenger side to what looked like the low drain area by the water bay. Should I be overly concerned? Has anyone had this happen?
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Old 10-23-2020, 11:31 AM   #2
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I have 07 KSDP and have also overfilled freshwater tank. Go inside and use some of the water to reduce it below the overflow valve and you should be OK





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Old 10-23-2020, 11:39 AM   #3
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Many owners have removed the peg board and modified both the overflow hose and fresh tank vent , to stop the overflow from syphoning out water while driving .
Before and after photos ; shamelessly stolen from other members .
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Old 10-23-2020, 12:09 PM   #4
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The floor in the peg board compartment should not be wet! You have either a loose overflow hose connection or a hole in your tank somewhere? By extending the length of the overflow hose up higher into a siphon break loop it will stop the siphon issue as well as keep a lot of your water from running out when you have a full fresh water tank & make a turn with the coach.

Happy Trails
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Old 10-23-2020, 12:17 PM   #5
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Great pictures by "Skip426" of exactly what the overflow looks like and should look like when done. I would add that you put a pinhole at the top of the overflow loop, to break any suction.

As to your issue....it sounds like you might have walked away while filling.....don't ask how I know. You may have caused the overflow hose to come off. Typically, when you overfill, the tank expands and then is forced to go somewhere! I think you need to pull the pegboard wall and see what happened. While you're in there, you can correct the hose.
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Old 10-24-2020, 01:39 AM   #6
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Check you air admittance valve. This was the source of my wet peg board compartment. Full details in this post:
https://www.irv2.com/forums/f103/ven...ak-338255.html
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Old 10-24-2020, 05:50 AM   #7
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We had a similar situation with our DS. After reading several posts I ordered new overflow hose from Amazon, when it came in I took the pegboard off and redid the overflow like the picture above.
One thing that surprised me was the old hose was not completely through the floor and the "duckbill" hose was stuffed inside the overflow tube. I extended the overflow tube about an inch below the floor and attached the duckbill to the outside of the new hose,all is working well.
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Old 10-27-2020, 05:41 PM   #8
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Seems to be working fine now

I took the peg board off and filled the tank to overflow and worked as expected
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Old 10-27-2020, 06:55 PM   #9
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Is the compartment floor still wet ?

Any sign of your leak ?

Looks like Newmar re-located and raised the air admittance ( vent ) valve , but didn't touch the overflow.
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Old 10-27-2020, 11:54 PM   #10
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Quote:
Originally Posted by Skip426 View Post
Is the compartment floor still wet ?

Any sign of your leak ?

Looks like Newmar re-located and raised the air admittance ( vent ) valve , but didn't touch the overflow.
No sign of a leak. Floor is dry as it has been 4 days now
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Old 10-31-2020, 04:14 PM   #11
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When we picked up our new Mountain Aire the peg board compartment was wet and the peg board stained. I guess I better pull the peg board and take a look.

One other question while we're talking about that compartment. What is the the 1/2" black hose that runs down from the floor through the compartment on the left side and out the bottom? It comes through the floor between the bedroom and and the half bath on the 4118. Any thoughts?

Thanks,

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Old 11-11-2020, 02:24 PM   #12
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I am getting ready to do the fresh water vent/siphon tube modification on my 2015 LADP. I find the extra step of drilling a hole at the top of the newly extended over flow tube intriguing. All the videos I watch about siphoning fluids say that creating a hole will stop the siphon effect so it would make sense to do that extra step.



Of folks who have made the tube relocation modification how many of you have also drilled the hole at the top of your newly reconfigured tube?
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