Black tank not venting?

[Jcheney55]

2015 GD Momentum M Class toy hauler. Front toilet has started belching a foul smell when flushed. Drained and flushed the tank a week ago and his been good until today when again when you flush it will about drive you out of the rig!! So what do you think? Blocked vent? Would this slow the tank from draining? How can I check/clear this vent? Where does this vent line attach to the tank?

I had a similar problem on my previous 5th wheel. When flushing the toilet air would burp up through the toilet, very annoying and unpleasant. I found that “dirt daubers” a type of mud wasp had completely filled in the vent pipe on the roof of the camper above the black tank. I used a water hose and screw driver to dislodge the dirt clod and let it fall and dissolve in the black tank. Problem solved.

[dishow]

We had a similar problem. Funny story for me. I was flushing the tank to get rid of thr smell and kind of forgot about it. Meanwhile the wife saw the toilet bubbling so stepped on the foot valve and it blew up in her face. There is a lot of poopy left even after draining and flushind twice. Told the wife it was too early to get shat faced. Still married though.