Black tank flush

[PhiDor]

The black tank flush on my 94 Excella is not working. Any thoughts on how to get it working? Could it be the vacuum breaker or check valve needs replacing?

[DesertStream]

Did you ever figure this out? We are purchasing a 1994 30' Limited with the same problem.

[triplenet]

Mine is not working either.
Acts like a valve is closed, no water gets thru system.
Bob

[SilverGate]

Whenever I see a thread about black tank flush problems, I think back to the thread, "Black Tank Flush" started by JmesDean in 2006.

When he attached the water hose and turned on the water, he heard a "pop". He thought something popped off and reduced his water pressure. One possibility is that if you attach a hose and turn on the water with too high pressure you might damage the check valve or something else in this "No-fuss flushing system".

So whenever I attach a water hose to my black tank flushing system, I feel the hose as I gradually increase the water pressure to the point where I can see that it is adequately flushing the tank without blasting out the system.

[PhiDor]

It seems like many of us have this problem. Now if we could figure out how to fix it.....