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Old 06-11-2019, 11:56 AM   #1
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Sewer smell in RV

I have an EVO T2460 that I bought new three years ago. Recently this past year I have had issues with the black tank smell to the point we canít even enjoy using the trailer anymore. I have run a hose down the vent through the roof to the tank, flushed the tank and I have filled the tank with bleach water all the way up to the toilet and let it soak for three days. I have filled the tank all the way to the top of the toilet to check for leaks no leaks I think my vent cap might be too close to the pipe but I had no problems the first two years I had the trailer this last year I cannot get rid of the smell. Does any have any idea if a cyclone vent will help?
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Old 06-11-2019, 12:34 PM   #2
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Have you tried replacing the air admittance valve(s) under the sink(s)?
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Old 06-12-2019, 12:50 AM   #3
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x2 on checking the AAV. Usually found way up under the bat sink in the tightest place they could put it in hopes the future owner has to find it. IF/when you do find it just give it a few taps with something like the handle of a screwdriver. There is a moving part in these valves that sometimes sticks open allowing black tank gas smells to enter the bath area via the AAV.
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Old 06-12-2019, 03:03 AM   #4
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If you have a Dometic toilet model #300 might be the issue, check thread below...

Dometic 300 toilet odor
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Old 06-12-2019, 07:49 AM   #5
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X2 on checking your type of toilet. Ours didn't take that long to start smelling, but if yours didn't leak too bad it may have taken a while to build up. If you have that toilet, use your phone to take a picture into the opening in the back, if there is liquid in there, that's your smell. Dometic replaced ours, so far the replacement is ok.
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Old 06-12-2019, 08:00 AM   #6
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Have you tried cleaning the "GRAY TANK" ?? We had odor problem in our old Jayco. Thought is was Black tank...NOPE...Gray tank was the problem. Filled it with water and "Blue Liquid" let it sit for several days and flushed multiple times...Odor GONE !
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Old 06-12-2019, 12:42 PM   #7
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Quote:
Originally Posted by TheWolfPaq82 View Post
Have you tried cleaning the "GRAY TANK" ?? We had odor problem in our old Jayco. Thought is was Black tank...NOPE...Gray tank was the problem. Filled it with water and "Blue Liquid" let it sit for several days and flushed multiple times...Odor GONE !
Good point! Often the gray tank can develop odors that are far worse than black tank odors.
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Old 06-12-2019, 01:35 PM   #8
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There is also gray tank crystals/pellets that you can get to add to the gray tank. They just lay in the tank and reduce the odor. Our Galley tank was bad about admitting odors into the trailer. Now a 1/4 cup of pellets clears it up in no time. Click image for larger version

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Old 06-12-2019, 04:47 PM   #9
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Thank you all for your replies. My toilet is in a room by itself so it’s pretty clear it’s not the grey tanks and they have been cleaned and checked. My service advisor suggested a cyclone vent which I put on right away. So far so good, no more smell. I just hope it keeps working as well .
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Old 06-12-2019, 05:17 PM   #10
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A cyclone vent is fine as long as you have a breeze. Sewer odors do not originate by themselves. They come from raw sewage. I think there is another underlying problem. I would dose that black tank with some RID-X along with a substantial amount of fresh water. In 2-3 days the RID-X will start braking down the "waste" that is causing the odor. Don't add any more bleach! All that will do is kill the bacteria that is required to break the nasty-smelly enzymes down.
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