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Old 02-13-2018, 10:06 AM   #1
MD3
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Fresh water loss while driving

I thought I read about losing fresh water out the over flows while driving but I canít find it now. At the time I didnt give it a second thought as I hadnít noticed any leaking out.

Yesterday I filled my water tank to the point of overflowing. Drive over to fill it up with propane then go over and fill with fuel.
While driving I notice Iím leaving water trails behind every once in awhile.
Get home and now Iím showing 2/3rds full !!
I lost 1/3 of my fresh water.....

Getting ready to head out for some dry camping in a couple days.
Any quick tips on how to stop the loss ? Maybe plug the overflows from the bottom ?
Whatís the long term solution ?


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Old 02-13-2018, 10:15 AM   #2
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We are still contemplating the best long term solution but putting some type of plug in each of the 3 lines after filling and while moving, but remove them while using, does work.
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Old 02-13-2018, 10:17 AM   #3
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Quote:
Originally Posted by MD3 View Post
I thought I read about losing fresh water out the over flows while driving but I canít find it now. At the time I didnt give it a second thought as I hadnít noticed any leaking out.



Yesterday I filled my water tank to the point of overflowing. Drive over to fill it up with propane then go over and fill with fuel.

While driving I notice Iím leaving water trails behind every once in awhile.

Get home and now Iím showing 2/3rds full !!

I lost 1/3 of my fresh water.....



Getting ready to head out for some dry camping in a couple days.

Any quick tips on how to stop the loss ? Maybe plug the overflows from the bottom ?

Whatís the long term solution ?





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I agree with you that youíre probably losing the water through the overflow tubes. Quick fix would be to see what material the overflow hose(s) is and put a plug or valve on it. I had a Bighorn fifth wheel years ago that had pex for overflows, so it was real easy to go to Home Depot and get a valve to put in. Let us know what you discover.
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Old 02-13-2018, 10:19 AM   #4
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I extended my over flows to where I can reach them and plug them when the water starts flowing out while filling. When I set up in my spot, I remove the plugs. Simple 1/2 inch garden hose ends and caps.
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Old 02-13-2018, 10:22 AM   #5
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Originally Posted by MD3 View Post
I thought I read about losing fresh water out the over flows while driving but I canít find it now. At the time I didnt give it a second thought as I hadnít noticed any leaking out.

Yesterday I filled my water tank to the point of overflowing. Drive over to fill it up with propane then go over and fill with fuel.
While driving I notice Iím leaving water trails behind every once in awhile.
Get home and now Iím showing 2/3rds full !!
I lost 1/3 of my fresh water.....

Getting ready to head out for some dry camping in a couple days.
Any quick tips on how to stop the loss ? Maybe plug the overflows from the bottom ?
Whatís the long term solution ?-
Common issue, used to happen to my Seneca all the time. Here is a recent thread where another Seneca owner has a water tank issue because his vents may have been plugged or valved without his knowledge. They just recently became the unit's second owner.

In that post I describe my permanent solution to the issue by building and installing an "air gap" that stops the siphoning without creating the potential to collapse the tank should one forget to open the vent lines.

Here is the recent post: https://www.jaycoowners.com/forums/f...ank-54228.html
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Old 02-13-2018, 10:46 AM   #6
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Originally Posted by Robbbyr View Post
Common issue, used to happen to my Seneca all the time. Here is a recent thread where another Seneca owner has a water tank issue because his vents may have been plugged or valved without his knowledge. They just recently became the unit's second owner.

In that post I describe my permanent solution to the issue by building and installing an "air gap" that stops the siphoning without creating the potential to collapse the tank should one forget to open the vent lines.

Here is the recent post: https://www.jaycoowners.com/forums/f...ank-54228.html
That's where I read ab It. Thank you !

What is an air gap and how does it work?
My overflows are middle of the coach. Any way to get to them without pulling the entire tank ?


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Old 02-13-2018, 11:54 AM   #7
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What is an air gap and how does it work?
My overflows are middle of the coach. Any way to get to them without pulling the entire tank ?-
An air gap in its simplest terms is a physical separation between a water outlet and the "flood level" of a container. If you imagine a kitchen sink and faucet, it is easy to visualize the water coming out of the faucet and falling into the sink. So the "air gap" is that space between the faucet and the sink's high water level. If the water supply was to somehow go into a negative pressure state (vacuum), it can't be drawn back into the faucet because of the "air gap". In a sense, a passive backflow prevention device. The manifold I fabricated and installed inserts that same "gap" between the vent/overflow lines and the water tank.

As far as to where your water tank vents are located I cannot say on the RB floor plan. You have more tanks than I do! On my TS they are very accessible by the simple removal of a panel from the outside compartment. Maybe another RB owner will chime in as to how you can access your vent lines.

In the meantime if you plug the outlets you will temporarily solve the siphoning issue, just be certain you remove the plugs before filling or using the tank!
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Old 02-13-2018, 12:25 PM   #8
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There are a few different ways to control losing water out the vent/overflow. I would just use a Sharkbite fitting since all you have to do is push it on the end of the pipe to attach. Then open for filling and when using water from the tank and close when traveling with a full water tank. Not sure what size drains you have but the fittings come in various sizes, can pick them up at Home Depot or order from Amazon. Here is a like to one of the various valves they have

https://www.amazon.com/SharkBite-230.../dp/B004XM6J1A
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Old 02-13-2018, 12:25 PM   #9
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Maybe not possible, but just a question on this topic. If the exit of the vent line is above the level of the tank, would that stop the siphon action. Seems like that is the case. Of course the problem with enclosed tanks is you then have a mess somewhere inside the RV. But on my 31DS for instance, where the water tank is external, in theory I could tie the vent line exit toward the top of the tank. Or am i oversimplifying?
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Old 02-13-2018, 12:42 PM   #10
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Maybe not possible, but just a question on this topic. If the exit of the vent line is above the level of the tank, would that stop the siphon action. Seems like that is the case. Of course the problem with enclosed tanks is you then have a mess somewhere inside the RV. But on my 31DS for instance, where the water tank is external, in theory I could tie the vent line exit toward the top of the tank. Or am i oversimplifying?
Our overflow lines are all together on the very top of the tank. They have a 90 degree bend and are plumbed out 3 holes in the compartment below to the street.
We are considering re-plumbing them into an actual vent configuration with an option for overflow in rare cases. This is how all our previous RVs from another manufacturer were configured.
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