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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Depending upon how the commode is plumbed. Many allow you to open the dump valve and see down into the holding tank (flash light required)and check the fluid level. Tank gauges are notoriously for being wrong.
