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Old 05-27-2016, 01:35 AM   #15
Join Date: Mar 2014
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Ditto the vacuum breaker under the sink, or sinks?

Our coach started to smell intermittantly and I noticed under the kitchen sink stank, so replaced breaker and it improved but didn't go totally away. After much rumaging and head scratching discovered a second one under the bathroom sink, well out of sight and conveniently installed (by Thor) tight up under the counter, clever eh? Changed it out and smell gone.
Another cause we've had is if the grey tank has got proper full, not back filling the shower, obvious, but gurgling slow draining sink. On empty our setup, proper p trap, can be sucked dry and smells, bit of water down fixes bit it can happen.

As to flushing the toilet with and extractor fan on, well, I only ever made that mistake once

Si, Sarah and Shelby the westie
2008 Damon Daybreak 3070
98 TJ, 4" lift, 31s, usual stuff
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Old 05-27-2016, 05:42 AM   #16
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My Damon has a furnace vent into the wet bay to bring in hot air to prevent freezing. That vent is in the duct that supplies the bedroom. When furnace isn't running, stink from wet at comes directly into bedroom. Also gnats and other things. Stupid design, Elkhart at its worst. I plugged it up.

John McKinley
2007 Damon Daybreak 3060, Ford 16,000# Chassis,
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Old 05-27-2016, 05:43 AM   #17
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Are you sure it is a sewer smell. Not a propane smell??
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Old 05-27-2016, 06:41 AM   #18
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Just blame it on the dog.
2007 Fleetwood Revolution LE 40V
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Old 05-27-2016, 07:37 AM   #19
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We couldn't find a source of odor, assumed it was black tank related. Ran shower until traps was full and that solved it, no problem since. Guess grey tank can really smell.
Safe travels, Tom & Jen, Middle GA
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Old 05-27-2016, 08:40 AM   #20
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I have had a couple of instances where the smell was from another camper being dumped. I would hook up the hose again to verify that it caused the issue.
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Old 05-28-2016, 08:49 AM   #21
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Whenever I connect my sewer hose to the campground sewer hole, and being there longer than one night, I make sure that the hose is configured to have a "P" trap in it..... This prevents sewer gas from backing up into the coach. This "P" trap functions the same as at home.
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Old 05-28-2016, 09:03 AM   #22
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Others mentioned the air gaps under the sinks...there may also be one on the washer/dryer hook up if you have one.
Dave & Sheryl Rambeau
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Old 05-29-2016, 09:18 AM   #23
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Same issue - in our case it was the drain for the washer in the bedroom. We don't use it much, and the water in the trap evaporated.
Bob - Folsom CA
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Old 05-29-2016, 10:59 AM   #24
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Bought new 5th wheel in 2009, had second A/C put in by dealer in bedroom.
Started getting odor inside after install. They did not seal unit correctly, and the unit was drawing some air from "attic" not from in room.
Found where sewer vent was not sealed properly on roof, A/C was drawing air from attic which was then drawing air from vent, and right into the trailer.
Might not be your problem, but who knows.
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Old 05-29-2016, 08:53 PM   #25
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Originally Posted by Blandry29 View Post
Same issue - in our case it was the drain for the washer in the bedroom. We don't use it much, and the water in the trap evaporated.
I found out this the hard way. ran a load thru the washer and ODOR gone!!!!!

Good luck!!!!!!!!!!
Bill & Jaylene; Chelsea, Chyna & Cybil (Chinese Cresteds)
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Old 06-01-2016, 03:10 PM   #26
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I had this same problem. My solution was to replace all the seals/gaskets on the toilet, including the one between the toilet and the floor.

Brad and Pat, the Dad and Mom-Dawgs with Kiddo and Dinah-Mite, the Dawter-Dawgs full timin' in our 2002 HR Neptune DP with 2015 Indian Scout Toad
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