I happen to have the same rig as yours. I had this trouble and I ended up filling the black tank with water after dumping and added some black tank additive. I let it sit for a day, drained it and then flushed several times. Mine just needed a good cleaning. Good luck with yours!
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Colorful Colorado
2002 Fleetwood Revolution 38B
Cummins 8.3L ISC
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