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Old 02-18-2019, 10:00 PM   #15
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When doing any flushing or open toilet valve operation always put the vent fan on "In", not "Out" and motor switch on high. That will push the smell out the tank vent system and not suck it toward you. Phew!
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Old 02-19-2019, 01:22 PM   #16
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Great ...all this helped tremendously
When you say black tank primed
What do you mean.
After emptying and flushing the black tank, you should get it ready for the next use cycle by putting in at least a few gallons of water, and your chemical/product of choice. I fill up the bowl once, put in some Happy Camper, stir it up with the toilet brush, then flush that down. Then I fill up the bowl again, put in some Calgon water softener and flush that down. Then I fill the bowl a third time, squirt in a bunch of Dawn, use that to clean the bowl, and then flush that down. That gets sloshed around while driving, and it gives me a nice base to start from so that there is plenty of water in the black tank to avoid it building up with solids.

Research the GEO Method.
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Old 02-19-2019, 08:20 PM   #17
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So if it is the air admittance vavle its probably just indide the wall opening, you can try covering it up with a bag and tape to seal until you can replace it. They normally unthread.

The use of a pumper truck sucking your tanks empty was talked about some time ago, you can lessen the chance of vacuum damage by holding the toilet flush open during this process.

Also ask the driver not to use maximum suction.


What exactly does the air admittance valve do ... because we put the plastic bag over it like suggested ... the smell is gone but we are worried ... worse things might happen with an non-functioning air admittance valve 🤣
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Old 02-19-2019, 11:07 PM   #18
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It allows drainage to pull air into the plumbing and tanks to break a vacuum that happens when water flows down a drain as evidenced by the typical ‘gurgling’ noise. It’s supposed to allow the intake of air, but not let air flow out of it. Yours is apparently failing to block reverse flow. Most likely the diaphragm is not seating properly or is damaged.
You may notice slow draining or the water in your sink trap not staying in there. Can be cured temporarily by letting the sink drain fully, then running a cup or so of water into the drain to refill the trap.
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Old 02-20-2019, 06:37 AM   #19
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All traps are typically requirred to have a vent downstream as said to aid draining and prevent the trap from being siphoned dry and loosing it's water seal keeping downstream odors where they belong. In trailers they use the air admin valve to keep from having to run excess vent piping in the trailer and having multiple roof penetrations with a typical vent pipe.
No harm in covering it up temporarily, the sink drain may not work as efficiently but in that short of a drain run and the low water volume from the faucet I doubt you will notice.
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Old 02-24-2019, 11:07 AM   #20
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I had the same problem. Turned out to be my batteries were over heating and caused the terrible smell. Had to replace batteries.
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Old 02-24-2019, 12:41 PM   #21
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The admittance value from most manufactures come apart , so you can fix , or replace , I have found in general plumbing , that issues come up and every time I have seen this happen , that taking apart [ some times cleaning ] you just reset by take apart & putting back together .
I do not see in the picture , so guessing behind the hole in wall .
I the diagram in the the next post it is not labeled - it is the Tee looking item next to the #1 - trap .
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Old 02-25-2019, 07:30 AM   #22
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Product recommendation: TankTechsRx. Probiotic and works great.
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Old 03-02-2019, 09:14 AM   #23
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Attachment 333806
Looks like the lavatory sink may drain into the black tank as well ????
I have a 2018 international Serenity 25 and tested whether the lab sink drains to the black tank. With both tanks empty the lav sink drained to the grey tank as it should.
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Old 03-02-2019, 10:33 AM   #24
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I have a 2018 international Serenity 25 and tested whether the lab sink drains to the black tank. With both tanks empty the lav sink drained to the grey tank as it should.
25RB and 25FB are not the same, manual shows RB lav going to black tank.
I think that may be a good thing keeping it more liquid, not so good though when the vents not working.
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