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Old 06-22-2024, 08:05 PM   #1
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THOR #25267
City water mixing with fresh water

We hooked to city water, the next morning we noticed water was coming out of our fresh water fill cap. Is there a control valve to switch that I need to turn so the city water doesnít mix into fresh water. Or do I have a problem with the valve that separates these tanks.

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Old 06-22-2024, 08:17 PM   #2
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It's not a valve, but the fresh water pump back-leaking. Unhook the city water, run the pump to camp. By the time you need to connect to city water again the crap in the pump allowing the backflow will have been flushed through.

You might also want to check and clean the pump suction strainer.
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Old 06-22-2024, 08:29 PM   #3
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THOR #25267
Thank you for your quick response. We are fairly new campers. So what youíre saying is donít hook up to city water right away. While camping run off the fresh water tank. How long should I run the fresh water? Is this correct?
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Old 06-22-2024, 08:44 PM   #4
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There is never a valid reason to be hooked to shore water except criminally long showers and to fill your internal tank.

Your problem is an excellent reason why not to have a hose attached to your rv.
Add in:
Burst hose
Freeze
Uncontrollable shore pressure.

Always use your pump and internal tank and you'll suffer no ills associated with shore water.

Fill as you need.
Fill as you leave.
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Old 06-22-2024, 10:00 PM   #5
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Yup, using the onboard tank and water pump is a good idea. Specially at night when you want to wake everyone up because you have to use the toilet.
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Old 06-22-2024, 10:26 PM   #6
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Yup, using the onboard tank and water pump is a good idea. Specially at night when you want to wake everyone up because you have to use the toilet.
I'm not jumping on the "always use water pump" bus, but this minimizes the water pump cycling when using it and gives you a pressure reserve for bathroom night calls and quick bathroom stops.

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Old 06-22-2024, 11:34 PM   #7
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Quote:
Originally Posted by ducksface View Post
There is never a valid reason to be hooked to shore water except criminally long showers and to fill your internal tank.

Your problem is an excellent reason why not to have a hose attached to your rv.
Add in:
Burst hose
Freeze
Uncontrollable shore pressure.

Always use your pump and internal tank and you'll suffer no ills associated with shore water.

Fill as you need.
Fill as you leave.
We at times on the day leaving with hook to city water & open Grey tank and both shower as long as we want
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Old 06-23-2024, 01:22 AM   #8
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I don’t know about your setup, but my Tuscany has a valve for either city or tank, if left on tank while city water hooked up it will feed into my internal tank and over fill it, and why would I want to run the 12v pump if city water is available and wear out the pump, with a pressure regulator on the incoming city line I have never had a issue.
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Old 06-23-2024, 03:25 AM   #9
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Originally Posted by simidrm View Post
I donít know about your setup, but my Tuscany has a valve for either city or tank, if left on tank while city water hooked up it will feed into my internal tank and over fill it, and why would I want to run the 12v pump if city water is available and wear out the pump, with a pressure regulator on the incoming city line I have never had a issue.
Hello my friend but... *wear out the pump*

We have never lost a pump in 7 years. 85,000 miles, 28 states.
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Old 06-23-2024, 04:47 AM   #10
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Hello my friend but... *wear out the pump*

We have never lost a pump in 7 years. 85,000 miles, 28 states.
It's not the pump that wears out: it's the pressure switch - every ON/OFF cycle burns the contacts.
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Old 06-24-2024, 02:23 AM   #11
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Originally Posted by Scubawise View Post
Hello my friend but... *wear out the pump*

We have never lost a pump in 7 years. 85,000 miles, 28 states.
Well you do you then and I will still do what I do.
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Old 06-24-2024, 02:30 AM   #12
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Well you do you then and I will still do what I do.
Ok buddy
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Old 06-24-2024, 02:32 AM   #13
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Well you do you then and I will still do what I do.
Is your reasoning the conservation of a $75 pump?
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Old 06-24-2024, 03:14 AM   #14
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There is a common issue with the Kankleak water valve that allows you to switch between tank fill and city connection. The valve will sometimes stick open allowing water to flow into your holding tank while supplying water to the motor home. There is a rubber "O" ring that can rip when you turn the valve that may also cause it to remain open to both the city water and tank fill. Try turning off the city water and release the water pressure in your hose. Turn the water valve all the way around to the desired position(tank fill or city) and see if that takes care of your problem before turning on the water for city. I had the same issue a couple of times with our 2018 Thor Siesta a couple of years ago.

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Old 06-24-2024, 02:11 PM   #15
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Is your reasoning the conservation of a $75 pump?
Same question.
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Old 06-24-2024, 02:17 PM   #16
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Most people don't understand:
I'm not trying to change their mind...
I'm checking to see if I need to change my mind.
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Old 06-24-2024, 02:42 PM   #17
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These Water service valves for RV's typically use a drilled ball valve to select and redirect flow between the required uses. BUT they are not industrial valves. When you turn the valve to a position say between two set positions the water will sometimes flow into two ports depending on the design of the valve. Sometimes when you are just slightly off the desired set location you can get a small leak past the ball valve and into another port. A very slow movement of water that overnight could fill the fresh tank to overflow.
Worn seals can do the same, but a quick reposition of the valve handle to slightly CW or CCW of the set position may fix it. Mine will always do it about 10 degrees CW when at city supply, never at 10 degrees CCW.
It's the design of the cheapest way possible. Picture is of a typical.
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Old 06-24-2024, 03:03 PM   #18
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Quote:
Originally Posted by pneumatics View Post
These Water service valves for RV's typically use a drilled ball valve to select and redirect flow between the required uses. BUT they are not industrial valves. When you turn the valve to a position say between two set positions the water will sometimes flow into two ports depending on the design of the valve. Sometimes when you are just slightly off the desired set location you can get a small leak past the ball valve and into another port. A very slow movement of water that overnight could fill the fresh tank to overflow.
Worn seals can do the same, but a quick reposition of the valve handle to slightly CW or CCW of the set position may fix it. Mine will always do it about 10 degrees CW when at city supply, never at 10 degrees CCW.
It's the design of the cheapest way possible. Picture is of a typical.
N/A most RVs including the OP's RV.
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Old 06-27-2024, 06:02 PM   #19
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THOR #32963
Water Pump

The check valve in the water pump has failed. I replaced my pump today myself for $75. Its location made it a pain to remove and replace, but the new one now operates properly and only comes on when there is a demand for water unlike the old one. Never use when connected to city water. An in line water pressure reduction valve is always good to use to insure you keep the pressure at 55 psi when connected to city water.

Good Luck
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Old 06-29-2024, 06:57 PM   #20
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THOR #4107
Our Hurricane does not back fill from city

Every model can have different plumbing, our Hurricane does not back fill from city water.
Not sure if the pump has a back flow check valve or the plumbing does.

Check with your manufacturer how should your unit work.
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