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Old 09-13-2020, 08:39 AM   #1
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Berkshire 2014 390FL Fresh Water filling

How do I determine when the fresh water is full without running inside and watching the guage?
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Old 09-13-2020, 08:50 AM   #2
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To keep it simple,

Know your gallons per minute fill rate. Will be most accurate at home.

Empty your fw tank.

Start your stop watch and fill your fw tank.

When you hit the gauge levels, record the elapsed time.

Now you will know how long it takes to reach a gauge level.
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Old 09-13-2020, 09:03 AM   #3
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Originally Posted by parise View Post
To keep it simple,

Know your gallons per minute fill rate. Will be most accurate at home.

Empty your fw tank.

Start your stop watch and fill your fw tank.

When you hit the gauge levels, record the elapsed time.

Now you will know how long it takes to reach a gauge level.
As long as every single place you fill at......is exactly the same GPM as the one you used for the test.
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Old 09-13-2020, 09:13 AM   #4
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Yup, I said that. Will be most accurate at home.
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Old 09-13-2020, 09:29 AM   #5
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How do I determine when the fresh water is full without running inside and watching the guage?
What I've done with every single popup, TT, that we've ever owned, is to run the water till it came out of the "Overflow Tube" underneath and then I turned off the water.
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Old 09-13-2020, 09:44 AM   #6
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I bought a small in-line water meter at Ace I just screw in and keep track of. On my coach the overflow tube is routed poorly so I prefer to keep track of the gallons (although an estimate rather than exact) that way. On past rvs we’ve had I just watched the overflow tube.
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Old 09-13-2020, 09:48 AM   #7
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Exactly where is the overflow hose? Do you suggest I overfilling once to find the hose?
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Old 09-13-2020, 10:01 AM   #8
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Yours may be placed differently, but on my coach I can see the hose when I open the compartment holding the fw (and the water pump). Every overflow tube I’ve seen comes out below where the fresh water tank is.
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Old 09-13-2020, 10:10 AM   #9
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Exactly where is the overflow hose? Do you suggest I overfilling once to find the hose?
I overfilled every time I filled the tank. Always knew the tank was full then.
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Old 09-13-2020, 02:24 PM   #10
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Exactly where is the overflow hose? Do you suggest I overfilling once to find the hose?


Be careful with Berkshires of that years. The overflow does not always allow water out and if you look at the fresh water tank some greatly expand upward with a big bulge
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Old 09-19-2020, 08:30 PM   #11
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What he said, but...

On my 2013 390FL, if I overfill, the tank does expand...then the overfill tube works but turns into a siphon partially emptying the tank. So I just watch the tank level behind the gray/black water drain and make sure I never overfill. Pain watching it, but I have the time...I'm retired!
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Old 10-17-2020, 12:47 PM   #12
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I've got the same coach. I just open the door on the passenger side covering the water tank and pump. Prop it open and watch the progress. I did forget at one time when I was filling and it did fill up and look like it was going to burst. I won't do that again.

Rich
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Old 10-27-2020, 01:59 PM   #13
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My fresh water tank bulges when I fill it, but I don't worry about it.

Basically, the tank is a wide rectangular box. The water pressure in the tank will naturally push the wide roof up. This wouldn't happen if the tank had a spherical shape, but that wouldn't be very efficient.

The tank looks like it is a pretty strong roto-molded plastic, so I don't think it will burst from the pressure of gravity in the tank. We aren't pressurizing the tank above normal atmospheric pressure as long as the overflow tube lets water out.

–Gordon
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