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Old 06-04-2018, 02:35 PM   #1
1980 Excella II
glh101282's Avatar
1980 31' Excella II
Los Alamos , New Mexico
Join Date: Aug 2003
Posts: 40
Water pump options

I am thinking of reversing the flow of city water after it enters the trailer so as to run it through the water pump to fill the fresh water tank without having to disconnect from the city water and using the fresh water fill tube. I would also have a T in the line to also connect to my my toilet wand to clean the waste tank without having to drag a water hose into the trailer. The wand has a one way valve, if you know what I mean.

Does anyone know of an RV water pump that does not have a one way valve or does not need one so I can flow water towards the fresh water tank as well as pump it out of the fresh water tank?

Having re-plumbed the trailer a number of times I could probably figure this out using a lot more fittings and PEX, but this would be a simpler way if it can be done and the space is limited.
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Old 06-04-2018, 06:34 PM   #2
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2002 25' Safari
Dewey , Arizona
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if your goal is to fill the tank with city water, just run a line around the water pump and have a valve on the line to control the flow. Filling the tank this way will require you to monitor the level as the flow will not stop when the tank is full.


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Old 06-04-2018, 06:55 PM   #3
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1968 24' Tradewind
Oxford, , Mississippi
Join Date: May 2009
Posts: 1,564
I did what AZflycaster suggests when I redid my 68. I used pex and 2 brass ball valves. If I need to fill the fresh tank I just close one valve and open the other and it fills the fresh tank while hooked to city water. Close the valve and all is good. I can send you a diagram of how it is plumbed, very simple. You do have to watch and not overfill.
I never use the filler neck to fill the fresh tank.
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2001 Toyota Tundra
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Old 06-05-2018, 08:31 PM   #4
1980 Excella II
glh101282's Avatar
1980 31' Excella II
Los Alamos , New Mexico
Join Date: Aug 2003
Posts: 40
Ball valves

With what you describe I think you have two 3 way Flar-it valves, sorta like the hot water bypass setup. That is a good idea and I will try it.

The problems I have had with 3 way valves in the past is determining which way the water is being diverted based on the valve handle orientation. I guess I can notate on the valve the water direction before installing.

The 3 way valves would also reduce the total number of fittings I will need to get the same result, which is good in the tight confines of the water intake/pump location at the bottom of the closet.
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Old 06-05-2018, 08:57 PM   #5
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2000 25' Safari
Davidson County , NC Highlands County, FL
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There is a pipe going from the water tank to the pump.
There is a pipe going from the pump out into the fresh water system.
Install a tee in the pipe between the water tank and pump. Install a tee in any cold water pipe that is beyond the pump. Then add a new pipe between the two tees with and a valve (gate or ball valve) that will allow water to flow in between, bypassing the pump. When connected to city water, opening this one valve will fill the water tank. When that valve is closed the system will work like original.
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