We have a 2002 Winnebago Ultimate Advantage and have a real problem. We are fulltimers (15+ years) and know not to dump before we're 3/4 full, etc. One week ago when I dumped I flushed the tank, as I do monthly and by the time I was done only clear water was coming out of the black tank. On Thursday we were starting a trip and I decided to fill the tank to 2/3 and go ahead and dump again so as not to carry the extra weight. I pulled the dump valve handle and nothing, not one drop came out. This unit has the cable type release valves. We were running late so I thought I'd wait until that night and then check it out. As it turned out do to other troubles on the trip we had a 420 mile day, so I didn't try to dump again until today. Still nothing.
I'm sure it's not a block because we are always careful about being sure there is plenty of liquid in the tank. And even in a blockage, after driving that many miles I'd think something would come out, even if only a few drops of liquid. Nada. I took the wall panel off in the pass through bay and was able to get to the valve. It's in a very tight space. When I pull the dump handle the cable pulls the rod out and when I push it in the rod goes back in. But no release from the tank. Also, while there is some resistance, it doesn't feel normal.
I tried the power flush, which resulted in the tank being full to the very bottom of the drop into the tank. Any more and it will back up in the tank. Still nothing. So I’m stuck with a very, very full tank and can’t figure out what to do. If I were able to figure out how to get to it and remove the bolts and pull out the valve itself, I think I’d have a real mess on my hands. But I don’t know what else to do. Any ideas? Please post here or e-mail me at
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