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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Our black always reads full. The only times it doesn't is right after a backflush. The tanks empty, it's just the level indicators that don't work properly. I understand this is a very common problem.
PS - If your tank is truly getting full, it will start making belching type noises when you flush. Then it's really almost full.
PS - If your tank is truly getting full, it will start making belching type noises when you flush. Then it's really almost full.
