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Old 07-07-2012, 04:53 AM   #1
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Fresh Water Tank Fills Unexpectedly

During a recent trip, I noticed for the first time that my fresh water tank filled to overflowing while hooked to shore water. Since I put only about 10 gallons in at the beginning of the season, something is up. Fortunately, I'm still under warranty, but thought I'd inquire anyway. Interesting that a while ago, I also found that my grey and black water tank valves were mislabeled. Perhaps my trailer was manufactured on a Friday!! Thanks, Jack
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Old 07-07-2012, 05:29 AM   #2
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During a recent trip, I noticed for the first time that my fresh water tank filled to overflowing while hooked to shore water. Since I put only about 10 gallons in at the beginning of the season, something is up. Fortunately, I'm still under warranty, but thought I'd inquire anyway. Interesting that a while ago, I also found that my grey and black water tank valves were mislabeled. Perhaps my trailer was manufactured on a Friday!! Thanks, Jack
Sounds like the check valve on the water pump is either stuck or has some trash in it. That's pretty easy for you to check, if you want. Simply unscrew the line going from the tank to the strainer on the pump, and turn the city water on. If water comes out of the pump, you've found the problem.
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Old 07-07-2012, 07:19 AM   #3
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Mine did that when it was brand new. Dealer replaced the pump due to bad check valve.

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Old 07-07-2012, 08:54 AM   #4
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I have never experienced this problem, but now I know the answer. Thanks!
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Old 07-07-2012, 09:36 AM   #5
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winter bypass blues

if your water heater bypass valves are in the bypass position, they will allow the gray tank to fill from city water. When winterizing your rig, placing the water heater valves in bypass allows the water heater to drain-into the gray tank. check those valves.
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Old 07-07-2012, 10:45 AM   #6
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if your water heater bypass valves are in the bypass position, they will allow the gray tank to fill from city water. When winterizing your rig, placing the water heater valves in bypass allows the water heater to drain-into the gray tank. check those valves.
If you look at the water heater plumbing, you'll see you are providing amazingly wrong information. There is one line to, and one line from the water heater... the bypass is just that... diverts the water from going through the hot water tank... that's it. It doesn't send it to the tray water tank.

The city water connection is nothing magical either... it ties in anywhere past the pump into the same line that runs all over the trailer. The water pump creates the 'end' of the line before the fresh water tank... so if you are getting your fresh water filled by the city water connection... you've got only one place to look... the water pump.
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Old 07-07-2012, 10:54 AM   #7
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Thanks for the answer to this one. Sometimes the mis-information needs to be pointed out. Like you stated there is nothing magical about this at all.
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Old 07-07-2012, 11:03 AM   #8
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Thanks for these responses. I did install a bypass valve with an input line at the water pump for winterization use. Since I have had the trailer through one season already and this seems to be a new issue, I wonder if the valve install may have created the problem? Jack
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Old 07-08-2012, 11:46 AM   #9
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Thanks for these responses. I did install a bypass valve with an input line at the water pump for winterization use. Since I have had the trailer through one season already and this seems to be a new issue, I wonder if the valve install may have created the problem? Jack
It it an actual bypass, or a fitting you can hook to a bottle of antifreeze? If it truly allows water to go from the input side to the output side of the water pump, then if it is leaking the next stop is the fresh water tank.
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Old 07-08-2012, 01:19 PM   #10
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Our trailer has an "autofill" feature that we enable/disable with a switch on the control panel. When autofill is turned on the fresh water tanks fills from the shore connection. If I don't turn autofill off the fresh water tank will overflow. The autofill indicator lamp is very small and I sometimes turn it on by accident. A few hours later somebody is knocking at the door telling me I've sprung a leak!

I don't know which years and models came equipped with autofill - just thought I'd mention it as a possibility.

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Old 07-08-2012, 01:46 PM   #11
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Had pump check valve failure in both my 2009 23 and the current 2011 25 and both were replaced at JC under warranty. A word of advice - either drain your tank if you want to stay hooked up to city water or unhook and use the water in the tank. If you stay hooked up with the tank full and water dribbling out of the fill overflow you will get hard water deposits on the side of the trailer and they are near impossible to get off. Ask me how I know!
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Old 08-11-2012, 05:59 PM   #12
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Water pump shut off valve

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