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Old 06-18-2015, 05:08 PM   #11
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Well filled the trailer paying attention to the indicator. Seems to be ok so far. Tomorrow will be towing it and will check once at the camping spot.
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Old 06-19-2015, 09:21 AM   #12
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I would think the overflow hose would be connected to the top of the tank. If that is the case I don't see how it could siphon. That can only happen if the overflow is running down into the tank. I wonder if Bullet Bob has some insight as to how the overflow is connected.
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Old 06-19-2015, 09:38 AM   #13
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I would think the overflow hose would be connected to the top of the tank. If that is the case I don't see how it could siphon. That can only happen if the overflow is running down into the tank. I wonder if Bullet Bob has some insight as to how the overflow is connected.
I can tell you exactly how it's attached in my Sierra. It's drilled into the side of the fresh tank with the bottom of the fitting about 1.5" below the top of the tank with the fill right next to it. You fill the tank, the fill pushes water to the backside of the tank, then once water comes out the over flow you turn it off. The water pushed to the back of the tank levels out and now you have water flowing out for ten minutes, usually below the full sensor.

And every time you turn, water will flow out.

And every time the trailer leans a little, even more will flow out.

So it doesn't really siphon in the true sense, but it looks that way.

I fixed mine with a T valve and a loop of hose draped over my LP tank. Now I can fully fill the tank and I won't lose any during travel.
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Old 06-19-2015, 10:10 AM   #14
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Thanks for the information. I'll have to look at that on mine.
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Old 06-19-2015, 11:11 AM   #15
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I just pulled my vent hose up so that the end of it is above the tank. Wire tied it there. Drilled a couple more 3/8 holes in the floor just in case I over fill. All well. Hasn't overflowed since.

Russell
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Old 06-19-2015, 11:12 AM   #16
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On my Freelander 3650SS the overflow lines, there were two of them, went into the top of the tank and extended down into the tank. I don't remember how far down they went but once they started syphoning they drained out quite a bit of water. I eventually installed three way valves in the lines so I could break the vacuum once it started.
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Old 07-01-2015, 09:48 PM   #17
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This almost sounds intentional. Can't believe a company that's been making RVs for 5 decades doesn't know how to vent a holding tank without creating a situation that allows a large % of the water to flow out

Will check this out when I take delivery of new unit in couple weeks. If water drains out I would consider this a design defect that needs fixing at company expense. That might get their attention.

WIll post what I discover in a few weeks.

I know Coachmen knows how to design a holding tank with proper venting. Our 2130QB had zero problems in 7 years and 25,000 miles with many tank fills to 100%.
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Old 07-01-2015, 10:20 PM   #18
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Well on my most recent outting I left with the gauge showing full. Was able to see some water sloshing out during some slow going corners when stopping to get a coffee before hitting the road. 2 hour trip setup the trailer and found the gauge now showing 2/3rds of a tank.
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Old 07-02-2015, 07:19 PM   #19
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Well on my most recent outting I left with the gauge showing full. Was able to see some water sloshing out during some slow going corners when stopping to get a coffee before hitting the road. 2 hour trip setup the trailer and found the gauge now showing 2/3rds of a tank.
You don't suppose the top light sensor is just not working? and you really have more? If you actually lost 1/3, how much water would that be?
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Old 07-03-2015, 09:47 PM   #20
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You don't suppose the top light sensor is just not working? and you really have more? If you actually lost 1/3, how much water would that be?
I tend to think it's right about losing water. What I did was filled the tank, when the full light came on I went and turned the water off so it wasn't full to the top but into the full range. Some water spilled out along the way to the point once setup it was showing 2/3rds.

18 gallons would be a 1/3rd of a tank.
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