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Old 09-24-2023, 09:25 AM   #1
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Filling up fresh water tank

When I fill up my fresh water tank, water drains out the driver side for quite a while after I turn OFF the water source. My specs indicate a 81gal fresh water tank with a 6gal hot water heater. Does this happen to everyone? If not, I would appreciate step by step instructions on how to 'properly fill' my fresh water tank.
All advise is appreciated.
Be safe out there!
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Old 09-24-2023, 09:50 AM   #2
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Get one of these and fill slowly. You may be over pressurizing your tank which then has to blow back to relieve the pressure.



https://www.amazon.com/Save-a-Drop-P...07&sr=8-6&th=1



I begin to fill, and about 5 minutes or so open a faucet in the kitchen for fill the hot water tank. Once the faucet stops blowing air and starts with water, I shut it off and continue the fill. When the overflow starts trickling shut the water off.
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Old 09-24-2023, 09:55 AM   #3
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Thanks for the reply. I normally fill with the 'standard' pressure regulator. That device seems pretty handy. If I am 'filling my tank', I am curious to how I would see water coming out of the hot water faucet.
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Old 09-24-2023, 10:15 AM   #4
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Thanks for the reply. I normally fill with the 'standard' pressure regulator. That device seems pretty handy. If I am 'filling my tank', I am curious to how I would see water coming out of the hot water faucet.

If you are using a regulator you are still forcing water in at 40-60 psi, what ever you have it set at. That is too much pressure for the tank and will expand it, possibly damaging it. Use a water hose and turn it low to avoid over pressure.


Once you have 10-15 gals in the tank, turn on the water pump, open a faucet on the hot side. Your water tank will begin blowing air as it fills. When it stops blowing air water comes out, turn off the pump, close the faucet and continuing filling the tank until the overflow trickles.
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Old 09-24-2023, 10:17 AM   #5
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The Internet is a wonderful thing! You can research about anything.


https://camperfaqs.com/how-to-fill-r...ith-freshwater
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Old 09-24-2023, 10:27 AM   #6
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ok got it. makes sense. will definitely try this out!
thanks for the input.
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Old 09-24-2023, 01:31 PM   #7
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If you look in your manual, it says do not overfill the tank. The tubes are for air. If you overfill the tank, it will go up and then down in the tube creating a siphon. It will run until the water level gets below the end of the tube inside the tank. It will also come out sometimes when you turn, pushing water up and out the tube. So, if you follow instructions and don’t overfill the tank, it will not drain any water. I just accept that they are there and if a little is lost, so be it.
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Old 09-24-2023, 02:13 PM   #8
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If you look in your manual, it says do not overfill the tank. The tubes are for air. If you overfill the tank, it will go up and then down in the tube creating a siphon. It will run until the water level gets below the end of the tube inside the tank. It will also come out sometimes when you turn, pushing water up and out the tube. So, if you follow instructions and donít overfill the tank, it will not drain any water. I just accept that they are there and if a little is lost, so be it.

Never had the siphon problem but you can lose a good third of your tank turning corners on the way to your camp. If you are on a 10 day hunting or camping trip every drop is important. That and the siphon issue can be stopped by installing a valve at the ends of the overflow. I had three overflows on the two 50 gal tanks on the toy hauler. valves stopped the water loss but you do need to remember to open and close them prior to filling and after.
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Old 09-24-2023, 03:05 PM   #9
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I like your idea. Can you be more specific regarding the modification? If my 'dang' indicators would work, I would have 'some' idea as to 'how full' my fresh water tank is. None of my indicators have worked for the last few years. No battery, H2O, Grey, or Black tanks show anything. Perhaps those that know can point me in the direction to finding out why they are not working. Or perhaps I should start another topic?
thanks for all replies!
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Old 09-24-2023, 03:11 PM   #10
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This is just an example. Other types are available including Sharkbite but it is simply adding these to the end of the overflow line.


https://www.amazon.com/Brass-T-handl...1&sr=8-34&th=1



I have a note in my pre check, and post check lists to be sure the valve is opened upon arrival at the campsite. The pre check list remind me to be sure they are open when filling and to close them when full. My toy hauler held 114 gallons with the tanks, water heater and lines. I was sure that I would arrive at the site with that many gallons and not a half empty tank.
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Old 09-24-2023, 04:00 PM   #11
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Originally Posted by smt0954 View Post
When I fill up my fresh water tank, water drains out the driver side for quite a while after I turn OFF the water source. My specs indicate a 81gal fresh water tank with a 6gal hot water heater. Does this happen to everyone? If not, I would appreciate step by step instructions on how to 'properly fill' my fresh water tank.
All advise is appreciated.
Be safe out there!
FWIW, the 81 includes the water heater.

You have a 75 gallon nominal tank and a 6 gallon water heater.
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Old 09-24-2023, 04:40 PM   #12
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Originally Posted by smt0954 View Post
I like your idea. Can you be more specific regarding the modification? If my 'dang' indicators would work, I would have 'some' idea as to 'how full' my fresh water tank is. None of my indicators have worked for the last few years. No battery, H2O, Grey, or Black tanks show anything. Perhaps those that know can point me in the direction to finding out why they are not working. Or perhaps I should start another topic?
thanks for all replies!
Check your 12 volt fuses if you haven't already. Our monitor panel fuse is the 4th one down from the top and is labeled "kitchen/monitor". If the fuse is intact you may have a loose wire or ground on that circuit either behind the convertor or underneath somewhere. Just a quick thought.
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Old 09-25-2023, 04:47 AM   #13
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If my 'dang' indicators would work, I would have 'some' idea as to 'how full' my fresh water tank is.

A quick trick for knowing how much water you are filling tank with: Time how long it takes to fill a 5 gallon bucket with water. Then you can just use that time to estimate how much water you have just put in your tank. Do this all the time when I get ready to travel and only want around 15 gallons in my tank for use on the road.
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Old 09-25-2023, 06:41 AM   #14
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Interesting...
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Old 09-25-2023, 06:42 AM   #15
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I have not done that, but I will some time today. thanks
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Old 09-27-2023, 07:05 AM   #16
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I bought on Amazon a water meter that screws onto your garden hose and digitally reads out the amount of water passing through the hose. It was about $14.00 and works great. I use one for rinsing the black tank so I know how much water I put in with the valve closed, and the other on the fresh water side to know how much I put in for travel days.
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Old 09-27-2023, 07:27 AM   #17
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Filling Fresh Water Tank

thanks for ALL the responses. Invaluable information since it comes from real RV folks.
To all - safe travels.
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Old 09-27-2023, 08:37 AM   #18
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I bought on Amazon a water meter that screws onto your garden hose and digitally reads out the amount of water passing through the hose. It was about $14.00 and works great. I use one for rinsing the black tank so I know how much water I put in with the valve closed, and the other on the fresh water side to know how much I put in for travel days.
Yes, if you look at my earlier post I added a link to that item on Amazon.
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Old 09-27-2023, 08:55 AM   #19
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I bought on Amazon a water meter that screws onto your garden hose and digitally reads out the amount of water passing through the hose. It was about $14.00 and works great. I use one for rinsing the black tank so I know how much water I put in with the valve closed, and the other on the fresh water side to know how much I put in for travel days.
For what it is worth, I had one of these and it failed after only a couple months.
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Old 09-27-2023, 09:18 AM   #20
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This sounds awesome...thanks - I didn't even know such a gauge/monitor existed!
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