Benrubid -
There have been a number of members who have experienced black water tank flushing problems similar to the one you described. The culprit may be a broken or faulty vacuum breaker located in the flushing system. If you do a forum search (black tank flush or similar) you will find quite a number of threads and posts about this topic.
One of our members, geo, has a diagram of this system and a post about an anti-back flush valve he installed.
Again, use the search feature to find input about the black tank flushing system.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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