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Old 09-21-2017, 03:57 PM   #1
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Fresh water tank

Since we have an enclosed underbelly, do we still have low point valve we need to use to fully empty fresh water tank? We measured water when filling it up last time and it only took 57 gallons in what should be an 80 gallon tank. We emptied it and measured it a second time, same results. Are we missing something?
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Old 09-21-2017, 04:10 PM   #2
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You sure it's supposed to have 80 gal?
Most models only have 60 gal.
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Old 09-21-2017, 06:06 PM   #3
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On my freshwater tank, the water outlet port is about 1 inch above the the bottom of the tank. So when the tank is "empty" there is still 1 inch of water left. I know when I am winterizing, I drain the tank, then drive the coach to a section of the driveway that is pointing up and to the passenger side, a lot more water will come out.
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Old 09-21-2017, 06:23 PM   #4
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Why did you decide it was full?
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Old 09-21-2017, 08:03 PM   #5
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Quote:
Originally Posted by brulaz View Post
You sure it's supposed to have 80 gal?
Most models only have 60 gal.
According to the specs it should have a 80 gal tank.
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Old 09-21-2017, 08:35 PM   #6
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What are you using to determine it's full. The tank gauge or the overflow?
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Old 09-21-2017, 10:01 PM   #7
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10 gallons of the 80 gallon total are stored in the water heater.
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Old 09-21-2017, 11:36 PM   #8
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OK on my 2017 25RDS there is a gate valve in the center of the fresh water tank with a pull lever just like the grey and black tanks.

The low point drains are under the sink in the bathroom. Low point drains are used to empty the pipes - not the tank.

The fresh water capacity is both the HWH and Fresh Water Tank. 10 and 70. The tank capacity is probably a calculated value based on the cu in of the tank. I was told to fill the tank until the gauge reads Full and not until the water comes out of the vent. In all my other rigs I have filled the tank until either the water comes out of the fill pipe and or vent pipe.
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Old 09-21-2017, 11:47 PM   #9
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OK on my 2017 25RDS there is a gate valve in the center of the fresh water tank with a pull lever just like the grey and black tanks.

The low point drains are under the sink in the bathroom. Low point drains are used to empty the pipes - not the tank.

The fresh water capacity is both the HWH and Fresh Water Tank. 10 and 70. The tank capacity is probably a calculated value based on the cu in of the tank. I was told to fill the tank until the gauge reads Full and not until the water comes out of the vent. In all my other rigs I have filled the tank until either the water comes out of the fill pipe and or vent pipe.
If the OP would tell us how he's determining it's full then we could give him a better answer. If I use the gauge on my 5er that holds 54 gals then I'd only get about 35 gal in it. After it reads full on the gauge the tank keeps filling for another 5+ mins after which it comes out the overflow. Also when I am dry camping and using fresh water and reach the 1/3 level on the gauge the pump starts sucking water. That right there tells me that the tank sensor is overly optimistic. If the OP's using his gauge then it's possible the gauge is the culprit.
FWIW I've been filling the tank using the overflow method for 5 seasons and zero issues.
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Old 09-22-2017, 08:24 AM   #10
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Fresh water tank

My husband filled until there was over flow.
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Old 09-22-2017, 08:31 AM   #11
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Fresh water tank

He had a water gauge attached to the hose and would have stopped filling when it showed 65-70 gallons, but it overflowed at 57.
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Old 09-22-2017, 09:11 AM   #12
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He had a water gauge attached to the hose and would have stopped filling when it showed 65-70 gallons, but it overflowed at 57.
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Old 09-22-2017, 09:32 AM   #13
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He had a water gauge attached to the hose and would have stopped filling when it showed 65-70 gallons, but it overflowed at 57.
Hmmm, thats interesting. Wrong size tank? Short of dropping the underbelly covering and physically measuring the tank then it's any buddys guess. If it were me I'd call ORV and explain your situation ans see if they have any ideas.
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Old 09-22-2017, 12:39 PM   #14
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When I use a digital flow meter, I come up about 15 gallons short. I'm guessing that a good chunk of that is because the TT isn't level when I am filling (due to the crown of the street). I'm not 100% sure that this would make up for 15 gallons, but I don't know where else the difference could be unless the tank is smaller than the brochure states.
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