alaskawalker Posted October 9, 2021 Share Posted October 9, 2021 The black water holding tank in my 2007 Holiday Rambler Neptune won't drain. Tried plunger, RV tank treatments, but it still eont drain. The grey water drains fine. Any suggestions? Link to comment Share on other sites More sharing options...
Gary M Posted October 9, 2021 Share Posted October 9, 2021 18 minutes ago, alaskawalker said: The black water holding tank in my 2007 Holiday Rambler Neptune won't drain. Tried plunger, RV tank treatments, but it still eont drain. The grey water drains fine. Any suggestions? I keep one of these with me to be able to spray water backwards into tank. Link to comment Share on other sites More sharing options...
redstickbill Posted October 10, 2021 Share Posted October 10, 2021 Are you sure the dump valve stem is screwed into the valve gate? Can you probe the drain line and get up the line past the valve ? Bill B 07 Dynasty 1 Link to comment Share on other sites More sharing options...
Dr4Film Posted October 10, 2021 Share Posted October 10, 2021 As Bill stated, the valve handle may be disconnected from the blade that slides back & forth. How long have you had the coach and did it ever work correctly when you first bought the coach? Link to comment Share on other sites More sharing options...
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