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Old 11-10-2015, 10:15 AM   #1
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Fresh Water Tank Siphoning

We have a 2012 Thor Serrano 34M that every time I fill the fresh water tank to the top, it wants to siphon out of the overflow tubing. It sucks to have to lift the bed up every time I fill the tank to not get it full to the top and start the siphon. Any Ideas?
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Old 11-10-2015, 11:16 AM   #2
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Originally Posted by Skippinhead View Post
We have a 2012 Thor Serrano 34M that every time I fill the fresh water tank to the top, it wants to siphon out of the overflow tubing. It sucks to have to lift the bed up every time I fill the tank to not get it full to the top and start the siphon. Any Ideas?
Skippinhead
To stop the siphoning try drawing a gallon or 2 of water from the tank with the water pump...(that works foe me).
Mel
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Old 11-10-2015, 04:35 PM   #3
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I drilled a 1/16" hole in the top of the elbow on the overflow tube. Small enough that no water comes out of it, but big enough to break the vacuum. Has worked for about 6 years now.
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Old 11-10-2015, 05:11 PM   #4
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If your overflow tube is such that you can put a cutoff valve in it, you can leave it open while filling until water starts coming out, then shut it off for a while to stop the siphoning! Just be sure to remember to open it in a few minutes.
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Old 11-10-2015, 05:52 PM   #5
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I drilled a 1/16" hole in the top of the elbow on the overflow tube. Small enough that no water comes out of it, but big enough to break the vacuum. Has worked for about 6 years now.
Sounds like a great simple idea.
Thanks
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Old 11-10-2015, 07:22 PM   #6
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Stop by a well stocked hardware store and visit the outdoor irrigation department and pick up a red drip irrigation emitter.

Red indicates 1/2 gallon per hour so it will have minimal water splash out but will allow air back in to break the syphon.

Most have a barb on one side and some have barb on both to allow supplying a pot via hose.

Just poke a hole into the vent hose with a nail then pop in the emitter and it will self seal.

They are very expensive. ..about 20 cents each.
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Old 11-10-2015, 07:30 PM   #7
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True story folks. All you have to do is break the syphon with a little air vent.
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Old 11-10-2015, 07:35 PM   #8
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Had that happen with our 2000 Dutch Star. Got more vent hose and ran it up higher, then back down and out the same hose. That worked on that rig.
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Old 11-10-2015, 07:41 PM   #9
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Stop by a well stocked hardware store and visit the outdoor irrigation department and pick up a red drip irrigation emitter.

Red indicates 1/2 gallon per hour so it will have minimal water splash out but will allow air back in to break the syphon.

Most have a barb on one side and some have barb on both to allow supplying a pot via hose.

Just poke a hole into the vent hose with a nail then pop in the emitter and it will self seal.

They are very expensive. ..about 20 cents each.
Something like this?
Where on the drain line would one insert this?

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Old 11-11-2015, 10:21 AM   #10
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Yes that is one example of many. Styles.

The input side is the barb on other is output.

The barb is self punching but a nail or automatic center punch helps.

DO NOT USE KNIFE OR ANY THING NOT ROUND as it will not seal.

This goes at the highest point in the overflow vent line so it will break any syphon by allowing air to enter.

You could attach a hose to other side to route the couple of drops of water but that water would block air from entering so leave it off.

A black or green one may be needed depending on the unit.

Test with breath air to be sure air can enter.

Do not use compensated ones as they do not work for this.
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