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Old 07-20-2020, 09:02 PM   #1
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Join Date: Jul 2020
Posts: 7
Sewer smell

Hello to all hope all is going well I have a question, we have a new 2020 Wolfe pack 365 16 and we are having the sewer smell especially in the upper main bedroom since it is connected to the main bath it has been waking me up at night and the smell makes you about sick and I thought maybe the smell was being pulled from the sewer vent by the ac unit but after some investigation I donít think so it seems to be coming from the bathroom from the drains but seem to be having a problem understanding how the smell is getting past the traps maybe someone else has had the same issue please let me know thanks Ray.
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Old 07-20-2020, 10:52 PM   #2
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Join Date: Jan 2016
Location: Colorado
Posts: 168
We had a similar problem. We knew the black tank had been properly cared for - but just in case we even changed to a different treatment chemical. Checked the vent & no problem there. Finally we pulled the toilet & found the flange seal had been installed with a couple inch section folded over. We ordered a new one from amazon & problem was solved. Itís not a wax ring like a home toilet. This one is rubber so put it on the toilet base (a very tight fit) & then set toilet into place. Worth checking! It solved our problem immediately!
Joe, Bettye & 2 mini-dachshunds

2018 Leprechaun 311FS
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Old 07-21-2020, 07:16 AM   #3
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Join Date: Jul 2019
Location: Maryland
Posts: 50
Check the air admittance valve under the sink in the bathroom. Should be a vertical pipe coming off the sink plumbing with a valve at the top. Most RVs have super cheap valves that are known to fail. When the valve fails, it allows air from the grey tank to come into the RV.

Replace the valves with a high quality valve. They are available at any home store and a good valve should be in the $25 range. Avoid another $4 one like the ones installed on your camper now.


I just replaced mine with those. Screws right on, no tools required.

If you open the door to your cabinet under the sink and get a strong sewer smell, then the vent is your culprit. You can test it by placing a bag over the vent and seeing if the odor goes away.

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Old 07-21-2020, 09:04 AM   #4
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Thanks for the good place’s to go look I will let you know what I find
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Old 07-21-2020, 09:34 AM   #5
Boss Ox & Drovergirl
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Join Date: Feb 2014
Location: N.E. Ohio Snow Belt
Posts: 1,151
Sewer odors are one of the most common and difficult to trace problems RV owners face. It is most often a toilet issue. Do you know what make and model toilet? Dometic 300 is the worst offender. There are plenty of threads on this forum dealing with the sewer smell.

We had a problem that we couldn't locate for a long time, till we discovered the black tank had slipped off it's bracket that holds it in place and separated from the down tube and gasket from the toilet. i Fortunately it was still under warranty and the dealer put everything back in place along with extra brackets to hold it all together.

Good luck!
Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2011 2500HD Silverado
1992 Goldwing Aspencade
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Old 07-21-2020, 01:05 PM   #6
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Thanks I will look into it when I get back to the camp site
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Old 07-24-2020, 05:04 PM   #7
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Hello and thanks to all the good places to look I have been looking around and have discovered that under the Bench seat where the heat unit is located they decided or someone did to bore a 2 inch hole in the floor to run 3 small wires through and that’s where I have located my smell getting in the problem is I still not sure where the leak is letting out the smell so more taking things apart to find the leak I’m sure I will probably not like what I find but it is still under warranty so I guess another trip to the dealership
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Old 08-30-2020, 02:41 PM   #8
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Well it’s at the dealership having the air conditioning unit replaced it went out and they said they could not find any leak so they just sealed up the holes to stop the smell�� we will see.
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