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Old 08-18-2018, 07:02 PM   #1
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what about a check valve on the tank overflow tubes?

A couple of times, we've filled the fresh water tank then drove a bit to the next stop only to find the tank 2/3rds or so full.

I'm wondering if the overflow tubes start to siphon and drain the tank. They're not easy to access so I don't think I want a valve.

But what about a check valve? A one-way check valve?
That should work, wouldn't it?
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Old 08-18-2018, 07:59 PM   #2
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Possibly. But the tank needs to be able to breathe otherwise it would become air locked.
Following.
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Old 08-18-2018, 09:20 PM   #3
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I'm not sure what kind of one-way/check valve you have in mind. Those vent tubes are meant for air to pass in both directions.

For a permanent, one-time fix, consider extending the tube and routing it up above the tank and pointing back down. That should prevent the siphoning without valves, plugs, etc.
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Old 08-18-2018, 09:40 PM   #4
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Quote:
Originally Posted by oldmanAZ View Post
I'm not sure what kind of one-way/check valve you have in mind. Those vent tubes are meant for air to pass in both directions.

For a permanent, one-time fix, consider extending the tube and routing it up above the tank and pointing back down. That should prevent the siphoning without valves, plugs, etc.
Good suggestion.
How many tubes are there and what do they look like?
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Old 08-18-2018, 11:06 PM   #5
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There are three on mine. They're the white 1/2" ID water hose just like the rest of the plumbing.
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Old 08-19-2018, 04:37 AM   #6
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A lot of folks have the problem of water siphoning out the overflow lines. Many have installed simple valves at the ends of the overflow lines. I used two 1/2" PEX ball valves.

The valves must be open when the tanks are being filled, otherwise the tanks can rupture; or the pump can collapse the tanks when suctioning water out of the tanks.

Here's what I do. When filling the tanks, at the first trickle of water out the overflow lines I shut off the flow of water into the tanks and close the valves. Usually a day or so of water use is necessary before the valves can be opened; the water level in the tanks must drop enough so that water does not continuously run out of the overflow lines.

pconroy, with three overflow lines do you have three fresh water tanks? Maybe one of the lines you are seeing is a low point drain for your piping?
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Old 08-19-2018, 12:43 PM   #7
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Our Seneca has three vent tubes, all routed from the top of the tank-along the wall and thru the wall to the outside of the compartment. I put the shut off valves as RVHiker did as there is not enough room above the tank to route the vent lines to avoid the siphoning.

RobbyR put together a home made vacuum breaker on his... Search for his post on the project.
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Old 08-19-2018, 07:12 PM   #8
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Quote:
Originally Posted by SloPoke View Post
Our Seneca has three vent tubes, all routed from the top of the tank-along the wall and thru the wall to the outside of the compartment. I put the shut off valves as RVHiker did as there is not enough room above the tank to route the vent lines to avoid the siphoning.

RobbyR put together a home made vacuum breaker on his... Search for his post on the project.
https://www.jaycoowners.com/forums/f...ank-54228.html

This is a link to the post talking about the vacuum breaker, it is described in post #8. I put it together from PVC fittings, it provides a separation between the connections to the tank and to the overflow/vent lines. It also is where I plumbed my hot water recirculation return line, that is the red pipe in my picture. That red line not needed if one just was looking to create a vacuum break.
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Old 08-19-2018, 07:39 PM   #9
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I put a plastic on/off valve in each of the three overflow tubes. I open them when filling the tank until water flows out. then shut them when traveling. re-open one or all of them depending on how level I am when I arrive at camp site. This has worked flawlessly now for almost 6 months.
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Old 08-20-2018, 07:07 AM   #10
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Thank you all for the correction and suggestions!
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