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Old 08-12-2019, 09:26 AM   #1
Wingrider214
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M.O.C. #23075
Black water tank flush

We have a 2012 3400RL that we bought used just over a year ago. When I connect a hose to the flush port for the black tank, water will not flow into the tank. Seems like there is an obstruction somewhere. I have filled the tank and added cleaner several times hoping to clear anything at the port of the tank. I am assuming there is some type of check valve on this line. I am looking for options to fix this problem without opening a hole in the underbelly.
 
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Old 08-12-2019, 10:09 AM   #2
Carl n Susan
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There is an anti-siphon valve in the flush line behind the shower wall. It has failed, not the first time this has happened. There are posts of how to cut the wall in the pantry to access the valve. The other solution is the find the lines behind the wall in the pass through compartment, cut them, and rejoin them with shark bite (or similar) fittings to bypass the failed valve. A Search will uncover a number of posts on both solutions.
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Old 08-12-2019, 12:26 PM   #3
BuilderBob
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Carl may be correct on the problem of your black tank flush it is common problem. But we had a friend that had the valve in the tank plug up and he had to pull it out and clean it out!
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Old 08-12-2019, 08:58 PM   #4
Wingrider214
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