Toilet burps water when flushing

[Bill Johnson]

You can test the vent by emptying the toilet then fill with coke and add a large bag of Mentos, you will know in a few seconds. (just kidding)

[Ozzy]

Mine did that because there was a clog between the toilet and top of tank, it was disgusting, I had to cut that line 2' above tank and dig it out!!::(( Jayco did a terrible job of plumbing to top of tank!! Very upsetting, no more #2 in front toilet.

[SmokerBill]

When mine starts "burping" I know that the tank is close to being full. I just press the pedal-valve slowly when flushing and there's no burp.

It's disgusting when the toilet burps and it splashes on your leg... and you don't know if that liquid is clear or brown.

[edatlanta]

Originally Posted by SmokerBill

When mine starts "burping" I know that the tank is close to being full. I just press the pedal-valve slowly when flushing and there's no burp.

It's disgusting when the toilet burps and it splashes on your leg... and you don't know if that liquid is clear or brown.

X2

[Camper_bob]

Learned VERY early NOT to do that. I had the fan running once and put my face directly above the "poop chute" to look in the tank. Got a waft of nastiness I don't desire to repeat right in the face.

So now, I make sure the fan is OFF and stand clear when activating that valve!

[Rock]

U never said what model u have. I have seen numerous people complain about this on my model FBTS. Mine does the exact same in upper toilet from about 1/4 to 1/2 full tank than stops doing it. My vent is not clogged and I am clueless as to why it acts this way. Common sense says it should get worse as it fills but does just the opposite and stops.

[PaulHi]

Tank is empty, the vent cap has been replaced. I have taken care of the poop pyramid and still no luck. No valve found from the sink.

I am tempted to run a water hose down the vent pipe to see if it is pluggeed. Anything bad that can happen if I do this.

Thanks,

PHi

[Rock]

A whole bunch bad could happen. I would shut off the water hold toilet flush valve fully open and blow low air pressure down vent line. I would think u would have air flow comming up thru toilet. If tank is completely empty u could instead open dump valve and see if air is blowing out the dump. Keep a container under dump just incase. Do not build up pressure just get air flow going.

[Bill Johnson]

It should work it's a direct pipe to the black tank

[Camper_bob]

I recall one owner on here whose black tank vent wasn't installed correctly. It looked like it was installed from the top after roof and walls were up. Factory cut a hole in the roof, and pushed the cutout down with the pipe and didn't make a connection to the tank.

So, no, I would NOT run water down the vent stack.

You said the vent cap was replaced; did you happen to look down into the stack? You should be able to see down into the tank from there? If you can't shine a light down and see into the tank, maybe have someone open the toilet valve and shine a light in from there. You should be able to see the light in the tank from the top of the vent stack. Assuming the vent stack goes straight up, I would imagine some do not...

[Bill Johnson]

Originally Posted by Camper_bob

I recall one owner on here whose black tank vent wasn't installed correctly. It looked like it was installed from the top after roof and walls were up. Factory cut a hole in the roof, and pushed the cutout down with the pipe and didn't make a connection to the tank.

So, no, I would NOT run water down the vent stack.

You said the vent cap was replaced; did you happen to look down into the stack? You should be able to see down into the tank from there? If you can't shine a light down and see into the tank, maybe have someone open the toilet valve and shine a light in from there. You should be able to see the light in the tank from the top of the vent stack. Assuming the vent stack goes straight up, I would imagine some do not...

He could use an Endoscopic inspection camera, mine has a 17 foot cable. It will allow him to find any obstructions. These inspection cameras are inexpensive now. I use mine for so many things. Every year I inspect the heat exchanger on the furnace for cracks. When working on a car everything under the dash is right there. Looking inside walls for running wires. I even used it to find all the wires in my old Jayco and where I could run new ones. This tool is invaluable, it records video and photos.

[Camper_bob]

Originally Posted by Bill Johnson

He could use an Endoscopic inspection camera, mine has a 17 foot cable. It will allow him to find any obstructions. These inspection cameras are inexpensive now. I use mine for so many things. Every year I inspect the heat exchanger on the furnace for cracks. When working on a car everything under the dash is right there. Looking inside walls for running wires. I even used it to find all the wires in my old Jayco and where I could run new ones. This tool is invaluable, it records video and photos.

Yup, I was going to suggest an endoscope, but not a whole lot of people have them. And if you don't have one, you could just use light to find out if there is a major obstruction.

Of course, this might be the perfect excuse to get one!! At least that's what I'd tell my wife!!

[Bill Johnson]

Originally Posted by Camper_bob

Yup, I was going to suggest an endoscope, but not a whole lot of people have them. And if you don't have one, you could just use light to find out if there is a major obstruction.

Of course, this might be the perfect excuse to get one!! At least that's what I'd tell my wife!!

Tell her it's for the puppy and she won't have a problem. lol

[SmokerBill]

Originally Posted by Bill Johnson

Tell her it's for the puppy and she won't have a problem. lol

You'll save money on your next colonoscopy, too!

[Bill Johnson]

Originally Posted by SmokerBill

You'll save money on your next colonoscopy, too!

That's what I told the wife and we would start with her

[Camper_bob]

Well, I would say something like "this conversation went in the crapper quick", but it started out there, so where else can you go?!

[anf76]

black tank is full or just about full. like another said, bathroom sink goes to black tank. it will fill fast with that set up.

[PaulHi]

I did run water down the vent pipe and it went nicely to the black tank. No back up or overflow. No indication of any clogs from the recent cleans and normal flushes go down nicely except the bubble is still there. The scope may be my next effort to see what is going on down there. It does help to flush slowly, but, the concern is the big poop may not go down as easily. But, I guess it is better than wearing it. I am wondering if it is possible that they didn't combine the vent to both toilets.

Thanks to all for your comments and ideas.

[Rock]

What unit do u have and it sounds like two baths?

[Bill Johnson]

Originally Posted by PaulHi

I did run water down the vent pipe and it went nicely to the black tank. No back up or overflow. No indication of any clogs from the recent cleans and normal flushes go down nicely except the bubble is still there. The scope may be my next effort to see what is going on down there. It does help to flush slowly, but, the concern is the big poop may not go down as easily. But, I guess it is better than wearing it. I am wondering if it is possible that they didn't combine the vent to both toilets.

Thanks to all for your comments and ideas.

I just had an idea and I could be wrong. Do both toilets burp? If only one does maybe the toilet that is connected directly into the black tank works fine but the other toilet has a drain pipe that connects to the black tank isn't at the top of the tank so when the tank is getting full it covers the pipe coming from the other toilet and it creates pressure because it is no longer vented because the pipe at the tank is covered by liquid. just a guess