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Old 05-21-2017, 11:47 AM   #1
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Fresh water tank being filled mysteriously.

While connected to city water, the fresh water tank is slowly being filled. I have no garden hose filling the tank and the water tank bypass is closed.

Any ideas on what is going on?


Chris Sherman
1999 Fleetwood Tradition (40')

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Old 05-21-2017, 11:57 AM   #2
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Sounds like the bypass should be open?

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Old 05-21-2017, 12:12 PM   #3
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Or bypass valve is defective
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Old 05-21-2017, 01:24 PM   #4
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Have had the same problem. The pump check valve is letting water back-flow into fresh water tank.
2002 Fleetwood Revolution 38B
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Old 05-22-2017, 09:44 AM   #5
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Thank You

It was the bypass valve and valve 2 (Name used in manual to designate the valve) both needing to be closed.
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Old 05-23-2017, 07:28 AM   #6
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Waroland has the correct answer. Either rebuild or replace your water pump. For added protection, add a check valve (or regular valve) between the pump intake and the water tank. Sometimes, if the city water pressure is too high, a pressure reducer will solve the problem as well.
Roger & Mary
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Old 05-24-2017, 08:15 PM   #7
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We have just purchased a used MH now that we have recently retired, had a travel trailer in years past, so we are figuring thing out ourselves also. Getting to your water tank problem....while playing with the various valves in our 1994 Allegro bay water tank I have discovered a valve that allows water into the tank from the city water connection if left open. I found this valve very near the cluster of valves beside the water pump and the tank. Thru experimentation with the various valves I soon found what each valve was used for. Not sure if your MH has anything like that or not but you may want to do a little experimenting to find out.
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Old 05-24-2017, 08:47 PM   #8
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I too may be experiencing a filling of the fresh water tank when connected to city as the monitor is showing full where just days ago it was only 1/3rd. The question I have is if in fact a check valve is failing (water pump only 3 months old) would not you eventually have a full tank and then water backing up out the outside fill area ending up on the ground?

Pretty sure my coach does not have a valve diverter which would fill the tank. Only via the outside gravity water fill port. It is also possible the sensor is just out of whack.

Bill and Debb---2010 CT Coachworks Siena 35V
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fresh water, led, tank, water

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