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Old 08-05-2016, 05:19 PM   #21
Join Date: Feb 2015
Location: Roswell, GA
Posts: 71
I had the exact same issue 2 weeks ago on my 328. In my case the tank would not drain at all. I tried using the black tank flush to clear the blockage. When I did this air pressure built up in the tank and when I opened the flush valve water and air began rushing up through the toilet.

I had to have the tank pumped by a septic company. During the pumping there was a loud pop, presumably the blockage, and the tank was quickly drained after that.

I am convinced there was a blockage in the vent that was stopping the black tank from draining and causing the pressure build up.

It has only been 2 weeks but I have not had any further issues draining the black tank.

Whenever I hook top now I always use the black tank flush to partially fill the tank with water.


(Ron & Karin)
2015 Georgetown 328TS
rkulbok is offline   Reply With Quote

black, black tank, tank

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