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Old 01-28-2022, 12:55 PM   #1
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Black tank roof vent leaking black water

We have a 2013 Fleetwood, Bounder, model 35K with a vacu-flush system, two toilets.
When the black tank was full, it would of course display full level reading. It would also, not allow the Vaccu-flush to operate showing a RED light at the indicator boxes in both bathrooms. This would clear once I emptied both tanks.
However, lately, the Vacu-flush works fine. But, the RED light does not show when the tank is full. Also, a small amount of black water came out of the roof vent. Of course, we emptied the black tank and cleaned up with appropriate fluids.

Has anyone had the same problem with their Bounder and the black tank roof vent releasing black tank water? and or also the Vacu-flush system not displaying a RED light indicating the Black Tank is full?
Is there a valve I need to replace? A switch to replace?

Now, the Vacu-flush pump is working fine. It is brand new; replaced about a year ago. There are no leaks at the pump, nor the toilets, nor the inside under the sink vents. No leaks at the black tank release valve to empty both the gray and black. Everything is working perfectly. Except what I described above with black water coming out from the roof vent.

Please, answer if this has occurred to your motorhome Vacu-Flush system. Especifically, the Fleetwood, Bounder series or one with similar system.
I appreciate your time and knowledge.
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Old 01-28-2022, 05:19 PM   #2
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I don't know what the problem is, but wow, black water on the roof. Sounds like it is time for a chemical tank cleaning.
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Old 01-28-2022, 06:31 PM   #3
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It would seem to me the full sensor has failed. If it was working you wouldn’t be able to flush when full. Usually it’s the other way around, the sensor stops you from flushing when you know there is room in the tank.

Take care

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Old 01-29-2022, 07:15 AM   #4
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I agree with Pointrow, check the sensor wiring might have come loose or mice chewed. I believe the sensors are on the outside of the tank. Been awhile since hearing about the black tank content on the roof.
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Old 01-29-2022, 07:54 AM   #5
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I have a '16 and the float for the full tank pump shut off is internal from what I understand. I suppose a piece of TP could be blocking it from floating up and stopping the pump. May want to call REV and see what sort of sensor you have.
I've never filled mine to check if it even works. Hopefully never will either.
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Old 02-15-2022, 04:59 AM   #6
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So I’m almost scared to look on the roof because in the last couple days when my Vacuflush is priming or pumping I hear this menacing gurgling in the wall between master and half bath which I understand is where the black tank vent runs up. I’m reading 2/3 full but I’ve had some sensor issues with it reading E also. So maybe I’m full and sensors are incorrect. Gonna empty today and hopefully rid myself of this demonic gurgle in the wall. It’s freaky, really. Sounds like ocean waves in the wall and that’s just wrong!
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Old 07-18-2022, 05:52 AM   #7
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Originally Posted by Wootieli View Post
So I’m almost scared to look on the roof because in the last couple days when my Vacuflush is priming or pumping I hear this menacing gurgling in the wall between master and half bath which I understand is where the black tank vent runs up. I’m reading 2/3 full but I’ve had some sensor issues with it reading E also. So maybe I’m full and sensors are incorrect. Gonna empty today and hopefully rid myself of this demonic gurgle in the wall. It’s freaky, really. Sounds like ocean waves in the wall and that’s just wrong!
OMGOSH! So I believe after that happened, my vent may be clogged. Anyone unblocked a Fleetwood Bounder 35K black tank roof vent? Silly question, may I rephrase? Those of you who have, can you tell me what you did to unclog your roof vent? Mine is a 2016. I think I’m dreading the answer….
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Old 07-18-2022, 11:29 PM   #8
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Black tank vent

Hello, we have continued to use a natural cleaning agent, Tank techsrx RV tank treatment, just science everytime we empty and service our tanks. It has worked. The sensors now show empty.
There has to be a valve of some sort to stop the black water from coming out through the top. Also, the vaccuflush system is very different than most other toilet systems.
I'm still doing research on it. We keep a very close eye on the tank levels. If you find any other info, do not hesitate to share.
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Old 07-19-2022, 02:01 AM   #9
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Your in luck, I found a guy with what looks to be the EXACT same problem!

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Old 07-19-2022, 07:01 AM   #10
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Quote:
Originally Posted by Wootieli View Post
So I’m almost scared to look on the roof because in the last couple days when my Vacuflush is priming or pumping I hear this menacing gurgling in the wall between master and half bath which I understand is where the black tank vent runs up. I’m reading 2/3 full but I’ve had some sensor issues with it reading E also. So maybe I’m full and sensors are incorrect. Gonna empty today and hopefully rid myself of this demonic gurgle in the wall. It’s freaky, really. Sounds like ocean waves in the wall and that’s just wrong!
No, Gray tank is the vent in the wall between the 1/2 bath and the bedroom. The black tank is the vent in the wall between the 1/2 bath and the living room (behind the TV). Call FW CS and ask for the drain plumbing diagram to see for yourself.
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Old 07-19-2022, 07:05 AM   #11
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Originally Posted by PURALIFE View Post
Hello, we have continued to use a natural cleaning agent, Tank techsrx RV tank treatment, just science everytime we empty and service our tanks. It has worked. The sensors now show empty.
There has to be a valve of some sort to stop the black water from coming out through the top. Also, the vaccuflush system is very different than most other toilet systems.
I'm still doing research on it. We keep a very close eye on the tank levels. If you find any other info, do not hesitate to share.
There is no valve in the vent to the roof. There are a number of reports of people pumping black tank liquid on the roof when their full tank switch does not work or was never hooked up. Always good to have an idea when your tank shows full on the tank gauges. They are a different system than the vacuflush sensor. They show full on mine before by vacuflush sensor shows full and shuts the pump down.
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Old 07-20-2022, 05:41 AM   #12
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There is no valve in the vent to the roof. There are a number of reports of people pumping black tank liquid on the roof when their full tank switch does not work or was never hooked up. Always good to have an idea when your tank shows full on the tank gauges. They are a different system than the vacuflush sensor. They show full on mine before by vacuflush sensor shows full and shuts the pump down.
Computerguy, that’s exactly right! I’m sure that’s why I heard the ocean in the wall. There is nothing to keep effluent from flowing out the vent on top. There really should be a one way valve. Also, I don’t believe my Vacuflush shut off switch was ever connected. Can you tell me where to look to see? It does not shut off when tank is full. I heard that wall gurgle the other day again before I was showing full. And you are also correct on the position of the vents. I was looking at the plumbing diagram backwards. But I’m telling you, I hear the gurgle between the bedroom and bath wall 🤷🏻*♀️
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Old 07-20-2022, 05:47 AM   #13
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Your in luck, I found a guy with what looks to be the EXACT same problem!

That’s hysterical!! And I can relate to both the poop geyser AND the burst hose, only when mine burst, it wasn’t just a squirt across my shirt. Full on frontal and facial dude!!! It was sooo bad. I felt like I’d been through a true initiation.

Also, I’m thinking that guy must have had a Bounder!!
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Old 07-20-2022, 09:17 AM   #14
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Your answer has nothing to do with the challenge! If you have nothing of importance to add according to the descriptive, the comments are totally unnecessary.
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