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Old 11-10-2015, 05:09 PM   #1
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Fresh Water Tank

Georgetown 377XL (2013)
While attached to city water my fresh water tank is also filling and overflowing. Anyone know where to look for inline valve that may be bad? The water pump appears to be okay or at least it is when I use the fresh water tank. Water does not leak out the water intake for city water when I disconnect the water hose.
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Old 11-10-2015, 05:23 PM   #2
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This happens when you are hooked up to city water without a water regulator.


To solve this you need to disconnect city water line
Open faucets inside and release pressure.
Drain Water tank to 1/3 or so.
Then hook back up to city water and DO NOT TURN on the 12 volt pump.


It seems when you have high city water pressure and you accidently turn on the 12 volt water pump the city water pressure doesn't let the pumps valve to close and it seems this fills up the water tank.


Anyway this is what has happened to me and this is my solution.
Hope it helps you.
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Old 11-10-2015, 06:00 PM   #3
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Water

Thanks Iggy. I will give your solution a try. Not using a regulator right now as water pressure is already regulated at 40PSI. I always measure water pressure whenever we pull into a camp ground.
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Old 11-10-2015, 06:22 PM   #4
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This happens when the back-flow valve in the water pump sticks or is seated improperly, usually because the pump was on when in public water. Disc connect public water. Turn on water pup and run water, Turn off water then water pump. Then reconnect to pubic water. You should be OK.
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Old 11-10-2015, 06:28 PM   #5
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Your pump has a check valve built into it that keeps the city water from back flowing through it and filling the FW tank. Yours may have a piece of debris stuck in it or it may just have not seated properly after using the pump at some point.

You will need to unhook from the city water and cycle the pump a few times to see if it clears/seats.
If that doesn't work you'll have to disassemble the pump to replace the check valve. Not a hard job and parts are available at most RV supply places.

If your pump is at an inaccessible location, you could always add an in-line, one way check valve in the outlet side plumbing near the water pump.
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Old 11-10-2015, 07:00 PM   #6
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Quote:
Originally Posted by Flybob View Post
This happens when the back-flow valve in the water pump sticks or is seated improperly, usually because the pump was on when in public water. Disc connect public water. Turn on water pup and run water, Turn off water then water pump. Then reconnect to pubic water. You should be OK.
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Old 11-13-2015, 09:07 PM   #7
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Had same problem. Looking on Internet this is a common problem with the pumps having faulty back flow valve. Rather than rebuilding or replacing the pump I installed an anti back flow valve on the outlet side of pump. This prevents the city water from flowing back into the pump and back into water storage tank. Cheap and easy fix avoiding a pump rebuild or replacement. You'll need a couple pluming fittings to adapt. Most any rv dealer should have.
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