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Old 05-23-2015, 10:29 AM   #11
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That is the holding tank vent/overflow and if the pump will not reset its backflow preventer and you have a winterization hose with the winterization selector valve and the winterization hose has a cap/plug installed you could switch over to the winterization mode and that will keep your holding tank from filling up till you can get a fix for the pump issue.
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Old 05-23-2015, 03:03 PM   #12
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I've run into this problem a couple of times in my 2011 Georgetown 327DS when I filled the tank before heading out for dry camping and rocking motion of the coach body while driving started sloshing water out of the overflow tube. It forms a siphon which will drain water until it drops below the bottom of the tube inside the tank. It appears on my fresh tank that the overflow tube extends almost half way to the bottom of the tank.

The overflow tube is a 1" clear plastic tube so I've been considering putting a small hole in the top of the tube to prevent the vacuum necessary for a siphon. I can't see getting a high enough water flow in the overflow to fill the tube which, at its connection to the tank is at least 1/2" above the tank. The small hole will have a small diameter tube sealed into it whose other end points down towards the road to prevent dust infiltration into the tank. (Another project for a time when my hands are idle.)

A shutoff valve in the overflow could cause problems if you draw water from the tank and have no way for air to enter it. This will cause the tank to collapse which has a high probability of cracking the plastic tank, causing a major replacement job.

Phil
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Old 05-23-2015, 03:33 PM   #13
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Quote:
Originally Posted by pmsherman View Post
I've run into this problem a couple of times in my 2011 Georgetown 327DS when I filled the tank before heading out for dry camping and rocking motion of the coach body while driving started sloshing water out of the overflow tube. It forms a siphon which will drain water until it drops below the bottom of the tube inside the tank. It appears on my fresh tank that the overflow tube extends almost half way to the bottom of the tank.

The overflow tube is a 1" clear plastic tube so I've been considering putting a small hole in the top of the tube to prevent the vacuum necessary for a siphon. I can't see getting a high enough water flow in the overflow to fill the tube which, at its connection to the tank is at least 1/2" above the tank. The small hole will have a small diameter tube sealed into it whose other end points down towards the road to prevent dust infiltration into the tank. (Another project for a time when my hands are idle.)

A shutoff valve in the overflow could cause problems if you draw water from the tank and have no way for air to enter it. This will cause the tank to collapse which has a high probability of cracking the plastic tank, causing a major replacement job.

Phil
The OP's issue is that when shore water pressure is applied water flows out the holding tank vent/overflow. Check valve in pump not positioned correctly.
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Old 05-24-2015, 03:35 AM   #14
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I've had two RVs with fresh water vent/overflow tubes that exited through the underbelly like edmonh's rather than venting next to the fill port. They were evidently placed too deeply into the fresh tank because each time I'd over-fill the tank, the vent tube would siphon out a bunch of the water. On one of the trailers, the siphon would remove about a fourth of the tank volume. I finally just stuck a cork in the tube and abandoned the vent.
Seems to me if you closed off the vent the pump over time would collapse your water tank.
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Old 05-24-2015, 04:17 AM   #15
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Seems to me if you closed off the vent the pump over time would collapse your water tank.
That's not the only problem you'll have. When in transit, it's perfectly fine to cap/valve/or otherwise close off the overflow vent. You just need to remember to open it back up before turning on your water pump.
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Old 05-24-2015, 10:14 AM   #16
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I use a 1/2 inch hose attached to my water hose. This slips into the fill connection and doesn't allow the tank to build up pressure. When the water comes out of the fill hole I know my tank is full. Only costs a few bucks and well worth it.


Jim
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Old 05-24-2015, 01:56 PM   #17
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2 thoughts
1. Not to insult your intelligence but are you sure your water is not connected to the tank fill?
2. Turn off the water supply and run several gallons out of the holding tank with the pump
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