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Old 08-10-2016, 12:00 PM   #1
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17FQ Fresh Water Tank Filling Up While Connected To City Water

This appears to be a common issue. After more than 30 nights of no trouble, on this outing I found our freshwater tank is now filling up while connected to city water. At first it was only a third of a tank after two days but it's gotten progressively worse where now it's filling up in just 24 hours.

I've read about checking/cycling/repairing the pump or even adding a check valve but I'm considering a simple shutoff valve since I will seldom use the freshwater tank.

Any possible issues with adding a 1/2" PTC shutoff valve? I have no problem reaching under the sink cabinets to turn it on should I ever need to use that tank, but on what side of the pump should it be installed or does it even matter?
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Old 08-10-2016, 12:57 PM   #2
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Like this? I put the valve on the output side of the pump.
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Old 08-10-2016, 01:00 PM   #3
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Quote:
Originally Posted by Teamfour View Post
Like this? I put the valve on the output side of the pump.
Exactly! Thanks.
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Old 08-10-2016, 01:54 PM   #4
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Well I just pulled the access panel and to my surprise there is already a cut off on the input side of the pump. Actually it looks to be a winterization tap but it will work nicely to shut off the freshwater tank when not in use. Also surprised to see so many spare parts laying around in there

I'm going to modify the panel for easy access and make some good use of all that wasted space.
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Old 08-10-2016, 02:00 PM   #5
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Be careful. If the valve is a winterizing valve and you turn it to the winterizing position to shut off the tank you will be opening the valve to the pigtail that goes into the antifreeze tank. If the pigtail does not have a good seal on the end and the back flow valve in the pump is stuck, you will flood the floor of the RV with water coming out of the pigtail.
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Old 08-10-2016, 02:11 PM   #6
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Quote:
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Be careful. If the valve is a winterizing valve and you turn it to the winterizing position to shut off the tank you will be opening the valve to the pigtail that goes into the antifreeze tank. If the pigtail does not have a good seal on the end and the back flow valve in the pump is stuck, you will flood the floor of the RV with water coming out of the pigtail.
Understood. The pigtail is capped and I plan on making sure it's tight and sealed properly.
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Old 08-10-2016, 02:33 PM   #7
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What Flybob says is correct (as always). That is why I installed a separate valve. The reason (my own, no empirical evidence) is that I don't want the 55 psi water pressure constantly present in the pump housing while on city water. I figured by eliminating that pressure in the pump it eliminates a few more spots where a gasket or something could fail resulting in a leak. Does that make sense?
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Old 08-10-2016, 02:48 PM   #8
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That makes perfect sense. When I get home I'm going to relocate the pump because access to the output side is a little awkward right now and then I'm going to add the cutoff on the output side. I can see how the filter attached on the vacuum side is also a weak point.
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