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Old 06-25-2021, 09:53 PM   #1
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Fresh water tank problem

Fresh water tank (portable water) will fill while hooked up to city water. What would cause this?

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Old 06-25-2021, 10:32 PM   #2
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Originally Posted by glforcve357@cox.net View Post
Fresh water tank (portable water) will fill while hooked up to city water. What would cause this?
A leaking one way valve on the water pump head.
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Old 06-26-2021, 01:42 PM   #3
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Some water systems in RVs that's the way you fill the tank. You don't indicate what RV you have but in many there is a wet bay with various connections and valves. Depending on valve selection the fresh water may go to the house and provide city water, or fill the fresh water tank.
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Old 06-29-2021, 08:06 PM   #4
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I agree with Beau388. I replaced my old pump with a new one that did not have a check valve (one way valve). I didn't know it was missing a check valve until my fresh water tank overflowed all over my campsite.
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