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Old 04-23-2014, 06:39 PM   #1
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How long to drain frest water tank?

I ask because I was surprised at how long it took. Just bought yesterday. The fresh was full when I was leaving the dealer and the valve was open to drain. I drove for 7 hours and still had water coming out of the fresh water low point drain. Not the 2 for the lines, only the one for the tank. I will have to investigate to see if there is a blockage or something. Just wondering if this has been seen and what the regular drain time is. I believe I have an 80 gallon tank - I haven't had time to run through all of the paperwork, nor is my memory the greatest.
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Old 04-23-2014, 06:51 PM   #2
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I have a 90 gallon tank only filled it once and it took forever to drain. I think it just has a very small line to drain.
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Old 04-23-2014, 06:53 PM   #3
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I have a 90 gallon tank and it takes a while. There is a lot of water that needs to make it out those very narrow drain valves. Also, if you are traveling, the water sloshes around, so you might be getting some water that normally doesn't make it to the drain might still be coming out. FW tank drains are often mounted on the side of the tank, and not the bottom. Also, the bottom of the tank often distends when filled, so you may actually have several gallons of water left in your FW tank even when the water stops coming out.
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Old 04-23-2014, 07:14 PM   #4
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If you Imagine a 1 gallon milk jug being filled by the drain....x80 ..... It takes a long time.

Also, in some states you will get pulled over for water draining while driving, even if it's fresh water
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Old 04-24-2014, 10:51 AM   #5
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Is there a reason (other than $) that they can't put a real drain line on those tanks?
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Old 04-24-2014, 10:59 AM   #6
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I apologize for asking but how often should the fresh water be drained? I have only camped twice and have not drained fresh water tank, not even sure how? sorry
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Old 04-24-2014, 11:13 AM   #7
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I apologize for asking but how often should the fresh water be drained? I have only camped twice and have not drained fresh water tank, not even sure how? sorry
At home I always run the water a bit to draw a glass of water. While we don't use our fresh water tank often, I alway drain it when we're thru using it. You should also do a search here on how to sanitize it. But others who actually use theirs should have a better answer.
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Old 04-24-2014, 11:17 AM   #8
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When full mine takes hours to drain, not 7, but ~3 hrs.
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Old 04-24-2014, 11:34 AM   #9
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Is there a reason (other than $) that they can't put a real drain line on those tanks?
That's kind of what I was thinking. I'm going to put it on my list to check that next time I have the rig in the driveway. It might actually be worth the trouble to put a bigger valve on those drains...

Also, I agree, it takes a long time, but nowhere near 7 hrs. My theory on your issue is there's a little left that shakes out after driving...?
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Old 04-24-2014, 11:42 AM   #10
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To speed things up, why not flip the pump switch on and open the faucets around the RV and then just open the grey tank to empty the water?

Or again, instead of going through the grey tank, open the low point drains on the waterlines... the pump would speed up the process I'm sure
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