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Old 05-22-2016, 01:44 AM   #1
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Gravity fill mod needed

Is it possible to fill the fresh water tank using the city water inlet and a valve?

I seem to remember that some cvs have this option. How does it work? Is it just a valve?

Thanks.
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Old 05-22-2016, 06:33 AM   #2
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Is it possible to fill the fresh water tank using the city water inlet and a valve?

I seem to remember that some cvs have this option. How does it work? Is it just a valve?

Thanks.
Yes...and some tubing. My Bounder had such a feature. It is a bypass that goes from the high pressure side of the water pump to the intake side of the water pump. When you have city water hooked up it pressurizes the plumbing system. The pump has a check valve on its output side to hold the system pressure. If you put in a bypass, the city water pressure will go around the pump and fill the tank.
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Old 05-22-2016, 07:22 AM   #3
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Is it possible to fill the fresh water tank using the city water inlet and a valve?

I seem to remember that some cvs have this option. How does it work? Is it just a valve?

Thanks.
If you have a OSS you only need a Hose to reach the F/W fill opening! Youroo!!
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Old 05-22-2016, 10:43 AM   #4
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Yes...and some tubing. My Bounder had such a feature. It is a bypass that goes from the high pressure side of the water pump to the intake side of the water pump. When you have city water hooked up it pressurizes the plumbing system. The pump has a check valve on its output side to hold the system pressure. If you put in a bypass, the city water pressure will go around the pump and fill the tank.
Brilliant, and easy! Thanks!

Does it also eliminate all of the venting issues? I suspect it will because the gravity fill tube acts as a super vent.

Any downsides to this mod? Why aren't all the RVs plumbed this way?
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Old 05-22-2016, 10:44 AM   #5
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If you have a OSS you only need a Hose to reach the F/W fill opening! :thumbs: Youroo!!

What is OSS?
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Old 05-22-2016, 10:47 AM   #6
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What is OSS?
Outside shower (OSS). And no internal plumbing work involved with this type of setup.
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Old 05-22-2016, 10:49 AM   #7
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Outside shower (OSS). And no internal plumbing work involved with this type of setup.
I do have one but don't understand how that would work. Can you elaborate with less acronyms please?

Thanks!
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Old 05-22-2016, 10:56 AM   #8
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Is it possible to fill the fresh water tank using the city water inlet and a valve?

I seem to remember that some cvs have this option. How does it work? Is it just a valve?

Thanks.
I'm curious, why would you want to?
Sounds like a LOT of work just to avoid cutting a hose to a couple of feet and using a funnel + our pump is in a very hard to reach area.
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Old 05-22-2016, 10:58 AM   #9
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Mine is VERY easy to reach and second gravity fill is such a pain, especially with the vent needing burping and then back siphoning.

Definitely doing the mod this aft unless someone can explain the OSS methodology.
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Old 05-22-2016, 11:01 AM   #10
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It is assumed you have the outside faucet in your external hookup bay and making a short piece of hose long enough to reach between your fresh water input port and that faucet with the applicable connections (readily available) on the ends and using the outside shower faucet valves to route the water from it to fill the holding tank. Of course I'm just trying to elaborate on the suggested input from someone else. I don't quite understand why you would want to try and do what it sounds like to me. If you have pressure to the city water inlet why not just hook to tank fill port? Confused I am.
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