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Old 07-07-2016, 08:55 PM   #1
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Stupid question about filling fresh water tank

What is the best way to tell when it's full? On my old trailer I would fill it until came out the little screened breather. When I was filling it tonight water was coming out underneath out the overflows. Tank gauge is reading 2/3 and flashing on F. Which is correct?
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Old 07-07-2016, 09:36 PM   #2
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I fill until the water starts coming out the overflows.
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Old 07-07-2016, 09:38 PM   #3
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Overflow it. Then you KNOW that it's full.....
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Old 07-08-2016, 07:30 AM   #4
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With overflow option, be aware of the 'siphon effect' if water continues to stream out of hose(s) after fill has stopped. Several posts on here about this potential issue (at least with A & Cs) and how to remedy.
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Old 07-08-2016, 07:55 AM   #5
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Unfortunately, the overflow tubes do exit under the RV.


Fill to you hear splashing on the ground.
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Old 07-08-2016, 06:35 PM   #6
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I use a funnel to fill the tank. It's pretty tight on the inlet so I don't get many leaks. The filler pipe must be slightly below the top of the tank, because when it's FULL and I remove the funnel, the water comes out of the filler pipe until the level reaches the bottom of the pipe.

If I keep filling until the overflow drain starts to drain from the bottom of the trailer, then when I remove the funnel it comes gushing out of the filler pipe.

If I have my wife inside, hitting the panel button every few minutes, when the 4th light is lit I stop filling and then when I remove the funnel I don't lose any water.
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Old 07-09-2016, 10:32 AM   #7
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Sometimes they put the overflow tube too far into the tank and it siphons water out
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Old 07-09-2016, 03:28 PM   #8
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Mine was siphoning when sitting still and when traveling, sometimes losing as much at 1/3 of a tank. The dealer installed shut off valves on the overflow lines. I use one of these https://www.amazon.com/Camco-40003-W...rds=Camco+fill when filling. Easy shut on and off, can adjust flow at the end of the fill and doesn't seem to overwhelm the vent at the fill port, so I don't blow my tanks out once I have turned off the over flows.


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Old 07-10-2016, 04:37 PM   #9
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FW overflow

Hello all, newbie here. I am working on sanitizing our brand new Whitehawk 27DSRL and have a question concerning the fresh water tank overflow line. Am I correct in assuming it is one of the two lines under the trailer beneath the shower area? They are labeled low point drain and not fresh water over flow line. Seems rather confusing and there are valves installed on both of them. I would expect no valves to be installed on "overflow" lines for safety reasons. Also I have filled the tank and never saw any water coming from these lines.
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Old 07-10-2016, 04:43 PM   #10
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These are my overflow lines with valves. Opposite side of these, you can see the fresh water holding tank drain. Your low point drain is the drain for the water in your TT's piped system. It's simply to drain the water in your pipes out easily.


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