Another Burping Toilet Issue 2018 Maxx T30DBH

[Spacerat]

Background:


Toilet has burped up when the tank is at 2/3 (displayed) since brand new. Cant take it to the dealer because the trailer sat idle due to COVID, then we forgot about the issue.



What I have done:


1. Took the RV to the dealer and had the tank power flushed.


2. Flushed it repeatedly myself


3. FLushed the roof vent


4. Measured the distance from the bottom of the black tank to the vent using a tape measure, got 2 inches between bottom of tank and bottom of vent pipe.




Today we are going to open a hole in the basement wall adjacent to the vent stack and attempt to determine if I can lift the vent out of the tank.



Any other ideas are welcome!


Jarrett

[Scrapper]

The idiot lights are hardly ever correct and burping is a sign the tank is getting full.

[Qwkynuf]

Originally Posted by Scrapper

The idiot lights are hardly ever correct and burping is a sign the tank is getting full.

But his #4 seems to indicate that the vent stack is inserted too far into the tank. Could his #4 prevent him from filling the tank with #1 and #2?

[Spacerat]

I agree with this, statement however it’s generally at or just before the 2/3 light illuminated. My suspicion is that the vent is too low In the ya k

[Spacerat]

Originally Posted by Qwkynuf

But his #4 seems to indicate that the vent stack is inserted too far into the tank. Could his #4 prevent him from filling the tank with #1 and #2?

This is my going in assumption.

[Spacerat]

I now have access to the top of the tank but the connection is confusing me. Possibly a tank grommet?

[Spacerat]

I can’t remove the pipe from the tank grommet. Moves up and down but seems to have a coupler on the other side of the grommet

[Oaklevel]

When our tank burps it is nearly full and time to dump, I do not use the idiot lights. The lights are rarely correct. I would leave well enough alone.

I really doubt that you will change anything.

[Spacerat]

SITREP: I have access to the stack, I have cut into the pipe, but remain unable to remove the pipe from the grommet. I have confirmed the tank is 5 inches deep all the way around, and that the vent stack extends over 2.5 inches into the tank which is far too much. Toilet burping starts at the transition from 1/3 to 2/3. Looks like FR put a coupler on the vent pipe on the tank side of the grommet, but for the life of me I cant figure out why..

[CaptnJohn]

Originally Posted by Spacerat

SITREP: I have access to the stack, I have cut into the pipe, but remain unable to remove the pipe from the grommet. I have confirmed the tank is 5 inches deep all the way around, and that the vent stack extends over 2.5 inches into the tank which is far too much. Toilet burping starts at the transition from 1/3 to 2/3. Looks like FR put a coupler on the vent pipe on the tank side of the grommet, but for the life of me I cant figure out why..

Probably the skilled labor master plumber put the coupler on the side of the tank

[Spacerat]

Confirmed. I have the section of pipe out now and they pushed the pipe in WAY further then the grommet adapter. They stuffed it past the the couplet and it was about 2.5 inches into the tank.

[fobagbob]

Good job Spacerat, I admire your persistence. Looks like the coupler is designed to be locked in the rubber grommet and when they glued the vent pipe into the coupler they pushed too hard and pushed it into the tank. I can see how the toilet would burp when the level got up to the vent pipe and sealed it off.

[Spacerat]

It’s fixed. Just ran a test and the tank started burping up after full light was illuminated, not at the 1/3-2/3 as before. What a PITA. Thanks a lot FR for the hassle.

[Jfkmk]

Congrats on troubleshooting and fixing this. When you own an RV you really do need to be a jack of all trades.

[Larry-NC]

[campers302]

Originally Posted by Spacerat

It’s fixed. Just ran a test and the tank started burping up after full light was illuminated, not at the 1/3-2/3 as before. What a PITA. Thanks a lot FR for the hassle.

Like it was stated above, thanks for the feedback. I have not experienced that problem but should it ever begin to I have this information. Never know when the vent pipe might fall/slide down. Great information.


Thanks Again

[Spacerat]

Now I have an access panel to the vent stack. Mounted with 3m dual lock and once the matching contact paper comes in it will look factory. Sideways pic apparently.