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Old 06-02-2013, 12:07 PM   #1
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1985 25' Sovereign
queensbury , New York
Join Date: Jan 2010
Posts: 11
grey tank valve trouble.

When I pull the grey tank valve every thing
Feels normal but the tank won't seems
There is no easy way to access the valve
Could it some how be cloged?. 1985 sovereign
Side bath.

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Old 06-02-2013, 12:15 PM   #2
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2014 20' Flying Cloud
Kooskia , Idaho
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Sounds like either the handle has become detached from the valve, or the valve itself is defective. Probably you will have to do some belly pan surgery to find the valve and repair it. I doubt it would be a clog, especially on the gray water tank side.

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Old 06-02-2013, 12:17 PM   #3
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Hinckley , Ohio
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The obvious is there water in it? Not the vavle but the pipe from the tank. Open the vavle and put a wire coat hanger that you streached out in it and stand back.
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Old 06-02-2013, 12:33 PM   #4
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1985 25' Sovereign
queensbury , New York
Join Date: Jan 2010
Posts: 11
The tank is three quarters full. Thinking
About cutting the pan. ???
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Old 06-02-2013, 01:26 PM   #5
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1970 21' Globetrotter
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Try blasting water from a garden hoses up the drain and then stand back.

If that doesn't work try it through a sewer cap with hose outlet blackwater valve closed of course. It may develop some back pressure that way.
Try the easy stuff before opening the belly pan
Rick Davis 1602 K8DOC
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Old 06-02-2013, 02:24 PM   #6
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I had the technician replace both black and grey valves last year on my 2004 Safari. The black was very hard to open and the grey wouldn't dump, similar to the symptoms you describe. The valves don't last forever.
I replaced the knife valves on previous r.v.'s as they were easy to get at.
I decided to hire the job on my Airstream as I saw no easy way to get at them. The work was expensive.
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Old 06-02-2013, 02:26 PM   #7
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Grand Junction , Colorado
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Some recent models have an access plate in the belly pan to access the valves. Depending what you put down the sinks, it could be clogged.


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