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Keeping the black tank valve open is *NOT* a good idea. The liquids drain right out and the solids build up in a pyramid that hardens and is a PIA to get rid of. Keep the valve closed and see if the problem returns.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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