I think you have a problem, they should drain fast without Interruption. Check the vent on the roof is a good start. Have some one flush your toilet at the same time as you are dumping the black water tank. If it is blockage in the tank it will not make a difference. If it is a venting issue the open toilet will allow the black tank to vent. Silverado
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2015 FunFinder 210uds, 2014 Silverado LTZ-Z71 Regular Cab Short Box, 5.3l with towing package
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