Toilet Burping

[Astrodave20]

We have a 4 week old Cedar Creek Silverback 33ik that when the black tank shows half full it burps or bubbles when you flush it. Is this normal?
Just upgraded from a 24 TT. Fulltimers since April, hitting the road in Feb next year.

[uhduh camping]

Tank is probably full. Sensors the most unreliable things in a RV.

[Cypressloser]

I don't even remember the last time I relied on the sensor(s), you'll learn pretty quick to notice the early signs of the tank filling up - and yes, when it burps it's full.

[lfussell]

Factory installed tank sensor are cheap, unreliable and essentially worthless. Black tank sensor is the worst because of the amount of solids that seem to be the culprit. Gray tank are the same sensors but normally experience less issues.
There are aftermarket sensors available but require access to the tanks to install. So, here is an easy try - Dawn[emoji768] dishwashing liquid. It can help both the black and grey tanks performance by removing grease and soap scrum.

[jertan19]

Originally Posted by Astrodave20

We have a 4 week old Cedar Creek Silverback 33ik that when the black tank shows half full it burps or bubbles when you flush it. Is this normal?
Just upgraded from a 24 TT. Fulltimers since April, hitting the road in Feb next year.

I have a 2019 31IK that had the same problem I took it to the dealer they found that the vent line was sticking too far into the black tank. He raised it up about 2” and that solved the problem.

[jd4010]

Originally Posted by jertan19

I have a 2019 31IK that had the same problem I took it to the dealer they found that the vent line was sticking too far into the black tank. He raised it up about 2” and that solved the problem.

Our RV, 37MBH, burps when it starts to hit about 1/2 a tank. I've had some suspicion about the vent line going in too far.....and this post helps to support that theory.

Any ideas how to raise up the vent? Wondering....is this something as simple as going up on the roof, removing the vent cap and pulling up on it or is there a lot more to it? Like is the pipe glued into the tank or is it sealed with a rubber grommet?

[jertan19]

They cut an access panel in the basement wall to access the vent cut the pipe and then glued the pipe back together using a coupling. How they determined that the pipe was sticking into the tank too far I’m not sure. One way would be to take a tape measure and run it down the vent to the bottom of the tank and get a measurement from the top of the vent to the bottom of the tank then raise the tape and hook the edge of the vent pipe. Subtract the difference and you would know how much the vent is off the bottom of the tank.