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Andy, maybe you have the "pyramid of doom" happening in your black tank. Have you tried running a snake up the drain pipe to see if the valve is actually closed. If it is open, you have a blockage. That's when things get exciting..lol
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Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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