Black holding tank won't drain past 2/3
After 4 days of camping we have a full holding tank. I open the black valve and hear a rush of fluids for about 1 min, then nothing. Check the tank level inside and it shows 2/3 full. After searchi...
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I gave up on my black tank sensors. I simply push the flush pedal down and shine a flashlight into the tank. Simple visual check for black tank level.
