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Old 02-12-2014, 10:13 AM   #1
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Potable water tank fills when connected to city water

I have a 2013 Berkshire 390FL. Recently I noticed my fresh water tank is filling up and overflow ing when I am connected to city water input. Is there a backflow valve that needs replacing? If so where is it located? Can it be fixed without replacing?
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Old 02-12-2014, 10:24 AM   #2
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Yes,waterpump. Youroo!!
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Old 02-12-2014, 10:25 AM   #3
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Usually back flow valve is part of the fresh water pump assembly.....
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Old 02-12-2014, 10:28 AM   #4
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Thanks, does that mean I need to replace the water pump or just a part?
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Old 02-12-2014, 10:32 AM   #5
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Is there a separate hose connection for the tank and city?

On my trailer I hook the hose up to one connection and turn a valve for city or tank.

I ask in case a valve was turned partially.
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Old 02-12-2014, 10:37 AM   #6
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There are separate connections for the inputs. I connect to the city water input and get water accumulating in the fresh water tank as well. This is a new situation that was not previously happening, so I feel some valve is not functioning properly
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Old 02-12-2014, 10:46 AM   #7
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A possible back flow?

If the water filter was plugged could water back flow enough to get into the tank.

That is if both city and tank water go thru the same filter.
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Old 02-12-2014, 10:47 AM   #8
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Suspect that water is being pushed backwards thru the water pump since that is about the only place the two have incommon.
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Old 02-12-2014, 10:53 AM   #9
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take the water pump apart and see if something is keeping the back flow open. put a new pump on it and the same thing can happen after one use..... get a piece of something in there and water will back flow.
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Old 02-12-2014, 10:57 AM   #10
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Use water from fresh water tank through pump a few times to see if check valve will seal properly(might have debris in it) then try city water again....hope it fixes it, if not like Brother Les says, take water pump apart.......
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