Black tank burp

[LeonDawn]

We have a 2018 Pinnacle 36FBTS. Dual black tanks. The toilet in the masterbath burps when you flush. The tank drains so I don't believe the vent pipe is clogged. But when I look down the toilet while flushing I can see part of what looks to be a white plastic ring. Bringing the RV in for service is not an option as we are living in it til our house is built. Is there a problem with using that toilet? And what is going on?
Thank in advance!!
LeonDawn

[GHen]

Sounds like a classic toilet paper pyramid has built up, happens to ours a couple times a year. I break mine up by sticking a hose down the toilet and spraying around to break it up.
Just because the tank is draining doesn’t mean everything to going out.

I also fill the tank about half full, add some Dawn detergent and even ice cubes and drive around to shake it up.

[Rock]

Numerous people have the same complaint with the FBTS. Mine up to half full is fine. Half to 3/4 burps. 3/4 to full fine. Vent is not clogged or anything built up in tank. I do believe it has to do how they plumed and vented the tank. The white ring u see is just the connector to the black pipe. U can take your basement wall down and follow the plumbing and vent. Like I said it is a weird bending curving set of pipes for this forward bath.

[Marine71-76]

Ours doesn't burp until full. Are you rinsing thoroughly until clear water runs out? Sometimes it will take 5 good rinses until ours runs clear. DW adds the chemical and then a good squirt of blue Dawn. Of course, we are then able to drive it to help slosh anything that might have stuck to the sides. Good luck.

[GeorgiaTrains]

I had the same problem for about a year and it was the forward toilet - would start burping when it got close to full. Finally one day I took a heavy duty plunger and really went at it making sure I had a good seal. I pumped real hard and finally a wad of toilet paper came loose and out the sewer pipe. Lesson learned - as much time as it takes refill and drain your tanks until the water runs clear - haven't had a problem since.