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Old 06-19-2019, 07:12 AM   #3
Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 7,907
M.O.C. #12156
You described problems with your galley gray. Don’t know if you keep open or closed. Your drain valve may not be opening/closing properly, something jammed in the valve channel itself. Try opening and closing the valve several times. With access to the valve under the belly, you can confirm and manually open and close. Could be some form of blockage in the line itself. If you know valve works, you could try closing, fill the tank to increase release pressure flow and dump and hopefully clear by pushing out the blockage.
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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