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09-21-2018, 09:56 PM
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#1
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Seasoned Camper
Join Date: Aug 2015
Location: Sharpsburg
Posts: 92
M.O.C. #17756
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Sewer Smell
Why do I smell a sewer smell outside the RV every time we flush the toilet?
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09-21-2018, 10:32 PM
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#2
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,923
M.O.C. #20477
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Are you leaving your black tank valve open? If so, keep it closed until you are ready to dump after a week or when you are ready to leave. Would also recommend using one of the chemical deodorizers in the black tank if you are not already doing so.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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09-22-2018, 03:51 AM
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#3
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Could be a blocked roof vent or tank leakage contained within the Coroplast belly.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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09-22-2018, 07:54 AM
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#4
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Montana Master
Join Date: Nov 2007
Location: Kville
Posts: 2,865
M.O.C. #7871
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Quote:
Originally Posted by AZ Traveler
....Would also recommend using one of the chemical deodorizers in the black tank if you are not already doing so...
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Deodorizers are a waste of money. You need to get rid of the odor, not try to mask it with a deodorizer.
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09-22-2018, 09:50 AM
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#5
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Established Member
Join Date: Mar 2004
Location: Brentwood
Posts: 36
M.O.C. #1292
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Is the bathroom vent cover open? Is the black tank vent pipe on the roof near the vent cover? Lastly and hope it isn't the vent pipe may not be connected to the top of the black tank.
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09-22-2018, 10:20 AM
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#6
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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I have seen where the camp's sewer vent was near our site. Anytime something went down the drain, it displaced stinky air from the vent.
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09-22-2018, 04:37 PM
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#7
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Is your hose screwed into the sewer outlet or just sitting in the hole? If it's not sealed some smell will come out around the hose outlet.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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09-24-2018, 08:18 PM
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#8
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Seasoned Camper
Join Date: Apr 2017
Location: Little Slice of Heaven..Missouri
Posts: 98
M.O.C. #19731
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I have same problem with my 2018 3721RL...parked at my lake lot with full hookups. I keep all tanks closed and only empty them at the end of my weekend. I too have a sewer smell outside on my patio after every flush. My Cougar never had the problem but my new Montana does. Wouldn’t a tank leak be dripping below the Fiver? If vent is plugged how could you smell it outside?
__________________
2018 Montana 3721RL
2018 Ford F350 6.7 Turbo Diesel
Life Comes Down to a Simple Choice..Get Busy Living or Get Busy Dying
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09-24-2018, 09:06 PM
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#9
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Montana Fan
Join Date: Jun 2017
Location: WESTMINSTER
Posts: 159
M.O.C. #20081
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My 2016 is doing the same thing and wish i knew why.
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09-24-2018, 09:53 PM
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#10
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Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
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Maybe it's time to do some investigating pull the back wall in your basement and check all the wast lines going down to the Black tank or pull down the coroplast and check to see if you have a crack or something wear the pipes go into the Black tank. We use Happy camper in are tanks and never have problem any smells or other problems!
__________________
Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails
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09-30-2018, 01:31 PM
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#11
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Montana Fan
Join Date: Aug 2017
Location: Colorado Springs
Posts: 101
M.O.C. #20440
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Please update if you discover the source. I don't have this issue, thank goodness, but as rv'ers we all can benefit from your investigation and findings.
Good Luck
__________________
Sandra & David
2017 3950BR
2016 GMC 2500 Denali
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09-30-2018, 10:48 PM
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#12
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Seasoned Camper
Join Date: Oct 2017
Location: South Jordan
Posts: 80
M.O.C. #20689
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Mine does the same thing. I went up on the roof and the smell is coming out of the top of the vent pipe every time the toilet is flushed - with chemical in the tank. I wonder if the issue is due to flush water entering into the tank and stirring up sewage gases that come back up the vent pipe and spread into the surrounding area around the trailer? I too would like to know how to rectify the issue? It can be embarrassing at times when camped close to others.
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10-01-2018, 01:05 PM
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#13
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Montana Master
Join Date: Jun 2017
Location: Northern Illinois
Posts: 525
M.O.C. #19994
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i tend to notice the smell when the weather is real still and humid, heavy air holding the smell down rather than dispersing with wind, just my .02
__________________
The "Black Pearl"-2017 3731FL Legacy Package
2017 F-450 Platinum, 6.7 PSD
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10-02-2018, 02:23 PM
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#14
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Montana Fan
Join Date: Nov 2010
Location: Chatsworth
Posts: 468
M.O.C. #10933
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If you had a leak near, at, or in the black tank or the sewer pipes, an outside smell would not be your main symptom. The smell would permeate the whole interior and the main storage area and the furnace would make matters even worse.
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10-03-2018, 09:17 AM
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#15
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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Just like your sticks and bricks house, you should smell sewer gases coming out of the roof vents. That's what they are designed to do. Vent the gases to the atmosphere. Depending on the wind and other weather factors, you will sometimes get a whiff of it.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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10-04-2018, 07:07 AM
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#16
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Montana Fan
Join Date: Oct 2017
Location: Tyler
Posts: 186
M.O.C. #20704
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Sewer smell
I purchased a “weather vane-type” cap for the top of the vent. That helped immensely. The ambient wind could be pushing tank gasses back down the vent (when you flush you get a pretty hefty odor). The weather vane helps to direct the flow of gases from the vent in the direction of the ambient wind outside. Easy installation but had to use pvc cement instead of the screws supplied.
__________________
Maxwell and Beverly Dow
2018 3730FL 2020 Ram 3500 Dually SWB
"Prairie Schooner"
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10-04-2018, 07:46 AM
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#17
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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Yes I have those also. I think they are called cyclone vent or something like that. They spin with the wind direction while drawing out the sewer gases.
I did not have any issues screwing them on however I caulked the trim rings into place.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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