airbubble from toilet

When mine does that it's because the tank is too full.

When mine did it the cause was the dreaded pyramid of poo. Rid x and a lot of water finally flushed it out.

Alternatively your vent could be blocked too.

When ours burps it is time to empty. Never rely on the tank gauges.

If your tank has been emptied and still does this then suspect that you have the pyramid built up and blocking the pipe going into the tank. The vent is the last choice even with a plugged vent stack there should be enough room for the air in the pipe to be compressed into the tank unless the tank is near full.

Don't know what kind of rv you have but on my 5th wheel, the pipe has a 45 degree angle to it going to the tank. If too much toilet paper and not enough water is flushed, it gets stuck in the pipe. A full toilet bowl of water is usually all that is needed to correct the problem.

Thanks all for the help. I will go and flush it from the outside system and inside.

Don't know what kind of rv you have but on my 5th wheel, the pipe has a 45 degree angle to it going to the tank. If too much toilet paper and not enough water is flushed, it gets stuck in the pipe. A full toilet bowl of water is usually all that is needed to correct the problem.

I had one like that except instead of water to correct it, it needed a little prodding.

If you can't figure out anything else go up on the roof and remove the vent cap. Verify that the vent pipe has not dropped down into the tank which does happen. If the pipe is still above the roof line try running a hose down the pipe to make sure it is not blocked.

That is the classic sign of a poop pyramid. searching this subject will get a lot of hits.

I got the easy fix. Go to Wally world and get the flexible wand that you stick down the toilet. It should have a nozzle on it that twirls under water pressure. Blast that pyraqmid to smitherines and move on.