black tank not venting?
We have a 2020 high end 5th wheel and also own a 2019 motorhome, and have owned many other coaches. This is the first time we have had this problem and I suspect a black tank venting issue but I welc...
Forum Discussion
Boon Docker wrote:SJ-Chris wrote:
It isn't clear to my why, even if the vent pipe is inserted 1/3 the way down into the black tank, why there would be pressure built up. It isn't a sealed system (because of the vent...even if the tube is submerged) so there shouldn't be pressure. Yes, the toilet might burp a bit, but not actual pressure.
The liquid would rise up the vent tube as the tank fills. When the toilet is flushed the liquid would rush back down the vent tube. Causing a release of pressure through the toilet.
The liquid would NOT rise UP the vent pipe beyond the liquid level (1 inch? 2 inches? 3 inches?). As more liquid is put into the tank (from the toilet), it would simply flow into the black tank. I agree with the OP that as liquid is flowing into the black waste tank, some air will release back into the toilet.
-Chris
