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Old 06-20-2016, 02:00 PM   #1
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Freshwater tank filled up while connected to city water

How can this happen? I have the city water connection from the faucet to the airstream connected at the right spot. I just returned to my camper to find water running out of the freshwater tank overflow. Checked the system status and my barely full tank is now full. Help please as I am on the road.
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Old 06-20-2016, 02:43 PM   #2
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Bad or stuck check valve?
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Old 06-20-2016, 02:44 PM   #3
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The check valve must be stuck or have a little piece of grit stuck in it, or just not be a very good valve. Follow the pipes and see if there is a manual shut off valve you could use or if running the pump will flow water back through the check valve and flush any grit out of the seat. Some check valves can be taken apart to look at the seat and I test them by blowing through them with my mouth. Any air leaks through when I blow, they are not working. Cheap to buy new ones if bad.
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Old 06-20-2016, 02:49 PM   #4
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Definitely a check valve. This happened to my new Classic after I had it about 3 months. It wasn't as bad as overflowing but my tank level monitor noted I had a significant amount of water in the fresh water tank and I know it was empty when I hooked up. Thankfully it was a slow leak into the tank. The dealer replaced the pump and all was well.

Jack
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Old 06-20-2016, 03:23 PM   #5
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If you disconnect the city water supply hose, and run the pump to take water from the water tank, you might clear out the check valve. You could do this cycle a few times, going back and forth from city to tank water, to further encourage the check valve to release any sediment stuck in it.

Keeping fresh water in the tank, and using the pump often, is a good insurance policy IMO.

All Airstream systems benefit from exercise . . .

Worth a try at least.
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Old 06-20-2016, 03:28 PM   #6
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PS -- one should not leave the trailer unattended with the city water hose bib turned on, for reasons just like this. If a pipe cracks, worse damage can occur during one's absence. Don't ask how I know this . . .



PS2 -- Sediment in the check valve can only get there from impure fresh water in the tank, which usually results from not using a particulate filter inline in the hose used to fill the tank, especially at campgrounds with well water. Even city water can have sediment in it and still be considered healthy. When they work on the water supply underground lines, all kinds of sediment and grit can get into the pipes. Also the pressure on -- pressure off -- nature of the work tends to loosen particulate matter inside the water mains producing cloudy water for a while. Safe to drink maybe, but it can cause havoc with check valves etc..

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Originally Posted by Native143 View Post
How can this happen? I have the city water connection from the faucet to the airstream connected at the right spot. I just returned to my camper to find water running out of the freshwater tank overflow. Checked the system status and my barely full tank is now full. Help please as I am on the road.
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Old 06-21-2016, 12:22 PM   #7
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Thank you everyone. As checking all the valves myself, at this point, is new to me, I liked all your suggestions. Called Airstream and they miraculously answered my call. Most likely stuck overflow/ check valve. Still under warranty will replace water pump. I'll try the on off approach too to see if that works. And good hint about turn off city water when not home. ��
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Old 06-21-2016, 12:28 PM   #8
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I'm with OTRA15 on hose. Especially if you accidently hook up to black tank flush inlet and fill that tank up......I discovered mistake just as things were thinking of getting messy!
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Old 06-21-2016, 12:54 PM   #9
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Quote:
Originally Posted by OTRA15 View Post
If you disconnect the city water supply hose, and run the pump to take water from the water tank, you might clear out the check valve. You could do this cycle a few times, going back and forth from city to tank water, to further encourage the check valve to release any sediment stuck in it.

Keeping fresh water in the tank, and using the pump often, is a good insurance policy IMO.

All Airstream systems benefit from exercise . . .

Worth a try at least.
Peter since we have the same unit, if you know, is the check valve outboard of the pump or elsewhere? I remember the strainer at the pump and cleaning it (no debris) at winterization, but didn't notice the CV

Bob
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Old 06-21-2016, 01:08 PM   #10
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I am not sure Bob, the check valve may be part of the filter assembly or the pump, but I am not going to remove that large drawer under the oven to check. And I know you understand! There may also be one inline between the filter and the tank, which might be visible in the rear storage area? Will look next time I am back there.

BTW I have not installed that little marine slide bolt to retain the large drawer in its closed position, and the recent trip involved some side-to-side curves which would have challenged the OEM drawer slide detente/keep-closed function. Did you put your keep-closed system in place when you went to Orca Island?

Peter
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Old 06-21-2016, 07:51 PM   #11
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There really isn't a check valve in your system that will stop the flow. The pump itself actually has four valves. Dirt may be your problem, and running the pump off and on for a while will likely solve the problem if that is the case. If the valves are themselves bad, you can either replace the pump or order a valve rebuild kit. The kit is pricey and hard to justify over the price of a new pump. If you decide to rebuild, be careful not to turn the screw on the very end of your pump (by the water lines.) This screw will adjust the pressure switch. If you do find a pressure problem after the rebuild, get a gauge to put in the outboard line and rest the pressure.
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Old 06-21-2016, 08:05 PM   #12
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Might try running the pump after city water is shut off and the city pressure is down, might clean it self out if not replace the pump....
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Old 06-21-2016, 08:14 PM   #13
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Kind of apples and oranges as I have an older trailer (1990). But it happened to me also. I was connected to city water, check valve failed, and fresh water tank overflowed and ruptured the fresh water tank inlet hose. I had an Airstream dealer fix it and disable the auto-fill "feature".

I'm not a big fan of automatic stuff. (I actually have the domain seekinganalog.com, after a career in high tech. Becoming a luddite in my old age.)

John
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Old 06-21-2016, 09:17 PM   #14
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I use a Camco water filter in my City water inlet hose, and have a shut-off valve just downstream of it. I also have a 'reminder sign' on my door, telling me to shut off the water when I leave for a long time.
So far, no troubles.
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