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Old 04-02-2017, 04:21 PM   #15
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I'm missing something here! I can understand that if the overflow tube is down into the tank that a siphoning action could occur. If it is NOT down into the tank, but just at or barely below the top of the tank, then it seems to me that if the siphoning action starts when the tank is full, that it should stop immediately when the water level gets below the level of the overflow tube!
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Old 04-02-2017, 04:24 PM   #16
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Old 04-02-2017, 04:27 PM   #17
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I'm missing something here! I can understand that if the overflow tube is down into the tank that a siphoning action could occur. If it is NOT down into the tank, but just at or barely below the top of the tank, then it seems to me that if the siphoning action starts when the tank is full, that it should stop immediately when the water level gets below the level of the overflow tube!
That top of the tank collapsed down with the siphoning, keeping the overflow fitting in contact with the water. I suppose it would have stopped if the top of the tank had reached its max flex and not allowed the fitting to contact the water.<br />
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Old 04-02-2017, 04:28 PM   #18
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John, still doesn't make sense to me. Looks like the siphoning would have been broken before the top of the tank could flex much, unless the overflow is way out from the end or sides and the material is VERY thin. The overflow on my tank is right in one corner.

Is it possible there is a clear tube going down into the tank that you are not seeing through the opaque walls?
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Old 04-02-2017, 04:39 PM   #19
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Well, just for giggles I tried it agsin and no siphon this time.
Just leave door open and watch from here on out I guess.
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Old 04-02-2017, 04:40 PM   #20
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John, still doesn't make sense to me. Looks like the siphoning would have been broken before the top of the tank could flex much, unless the overflow is way out from the end or sides and the material is VERY thin. The overflow on my tank is right in one corner.

Is it possible there is a clear tube going down into the tank that you are not seeing through the opaque walls?
Nope.
The overflow pipe is also your air breather pipe. If this pipe is full of water, no air can get into the tank to replace the water that is flowing out. Therefor, collapsed tank.
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Old 04-02-2017, 04:59 PM   #21
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Nope.
The overflow pipe is also your air breather pipe. If this pipe is full of water, no air can get into the tank to replace the water that is flowing out. Therefor, collapsed tank.
Well....I wonder what the other fitting on top of the tank is for then? I wish they supplied schematics! lol

What you say makes total sense on the way it acted.
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Old 04-02-2017, 05:03 PM   #22
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Next time your filling your tank thru the hose, put a finger under that overflow pipe. you will feel the air pressure pushing your finger off .
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Old 04-02-2017, 05:09 PM   #23
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Can you find the 'bitter end' of the overflow tube? Or can you disconnect it from the tank and blow it out to see if its clear? Remember the condensate drain tube on Dometic refrigerators? It was a 1/4" tube with a little porous plug on the bitter end to keep the bugs from crawling in for a drink? I wonder if yours has such a plug (that might be plugged) on the end? Worth a check!
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Old 04-02-2017, 05:11 PM   #24
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Can you find the 'bitter end' of the overflow tube? Or can you disconnect it from the tank and blow it out to see if its clear? Remember the condensate drain tube on Dometic refrigerators? It was a 1/4" tube with a little porous plug on the bitter end to keep the bugs from crawling in for a drink? I wonder if yours has such a plug (that might be plugged) on the end? Worth a check!

Bill, I don't think that would work in this case because the water has to flow at a high rate.
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Old 04-02-2017, 05:17 PM   #25
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Next time your filling your tank thru the hose, put a finger under that overflow pipe. you will feel the air pressure pushing your finger off .
Good thought! It is full now, but I can fix that!
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Old 04-02-2017, 06:19 PM   #26
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Not a thought, I've done it!

Gota do something to keep yourself amused while your watching the tank fill !!
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Old 04-02-2017, 06:35 PM   #27
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Captjake1 - My fresh water tank has done this twice. The first time, I had filled my tank at a campground and shut off the water when I saw the overflow. Sometime later, I noticed it was still overflowing! I checked the water inlet and verified it was off. When I looked under the bed at my tank, I couldn't believe my eyes - the top, bottom and all sides were caved in! Turning on a faucet with the pump off didn't relieve the vacuum. Removing the water fill hose and switching to tank fill didn't do it either. The only thing I could think of to get air into the tank and relieve the vacuum was blowing into the overflow tubing underneath the rv. This worked and I could hear air rushing into the tank from the overflow tube. The tank mostly regained it's shape.

Although I can not completely see around my fresh water tank, I haven't been able to find a vent. In the five years I've had this rv, it did it for the first time at the end of last season. It did it again today when I filled it to get ready for this season. I was able to quickly blow into the tubing to break the vacuum. Something must have changed and I agree it is most likely a plugged vent. I just haven't found it yet.
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Old 04-02-2017, 06:37 PM   #28
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OOPS-I meant VENT tube..........
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