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08-10-2018, 09:58 AM
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#1
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Camp-N-Nut
Join Date: Jun 2014
Location: Ephrata, PA
Posts: 105
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Sewer smell from sink
2015 CC 34 RLSA sewer smell comes from bathroom and kitchen sink and shower when I turn the water on. Vent is open on top of trailer. Any suggestions? It just started 3 days ago. Before that no problems.
__________________
2015 Cedar Creek 34 RLSA
2006 Dodge Laramie Dually Cummins
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08-10-2018, 10:24 AM
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#2
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Senior Member
Join Date: May 2014
Location: Alberta - East of the Rockies, West of the Rest
Posts: 1,785
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1. It could be one or all of the air admittance valves under the sink(s) are worn out and need to be replaced.
2. Reverse air flow from the the campground septic. Keep your dump valves closed or as a minimum lay out your dump hose so that it droops down in one place and forms a 'P-Trap'.
3. Install a better vent cap that aids with drawing air up and doesn't allow for reverse airflow down into the tanks.
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2018 RAM 5500 Laramie CC
Sold: Riverstone Legacy 38RE, 960 Watt Solar, 6x6 Volt AGM Battery Bank, Freedom SW 3012 Inv/Charger
Ordered: 2021....
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08-10-2018, 04:21 PM
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#3
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Senior Member
Join Date: May 2016
Location: Northwest Florida
Posts: 287
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Any smell with the water turned off? Are your exhaust fans running?
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2016 Ram 3500HD 6.7L CTD 4x4 CCSB
2017 CC 34RL2 Hathaway Edition
Andersen Ultimate 5th Wheel Hitch
Nights Camped: 2017=61
Nights Camped: 2018=25
Nights Camped: 2019=12 | Booked=6
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08-10-2018, 04:40 PM
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#4
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Camp-N-Nut
Join Date: Jun 2014
Location: Ephrata, PA
Posts: 105
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No smell with the water turned off. Exhaust fans are off. Only stinks when you first turn the water on and only lasts about one minute then goes away. The smell is coming from the drain
__________________
2015 Cedar Creek 34 RLSA
2006 Dodge Laramie Dually Cummins
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08-10-2018, 04:52 PM
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#5
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Denver To Yuma In 90 Days
Join Date: Mar 2018
Location: Yuma, Arizona
Posts: 3,882
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Highly possible you have sludge buildup in the gray tank, which usually smells worse than the black tank!
Might need to do a power flush of the tank to clean it out, plus, I've got a video for you to watch.
Only 5 minutes long, but must watch it all:
Plus, there is a Camco product that has a lemon scent that you can get in the RV section at Walmart, Camping World or any other RV supply store, plus several other products to help eliminate gray tank odors.
Hope this helps!
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08-10-2018, 04:55 PM
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#6
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Senior Member
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,477
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As noted above the air admittance valve is stuck open. Put a baggie and rubber band over it until you can clean or replace it. Many photos online here if you do a search.
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Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
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08-10-2018, 04:59 PM
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#7
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Senior Member
Join Date: Oct 2014
Location: Wilmington, De
Posts: 239
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Could also be hot water heater. If it has rotten egg smell might need to flush it out if water has been sitting there too long
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08-11-2018, 01:25 PM
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#8
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Junior Member
Join Date: Oct 2017
Posts: 2
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Could be fresh water tank
I had this problem last year. I didn't dump my old fresh water and it smelled like a sewer. Added a few teaspoons of Clorox to the fresh water tank and it cleared up.
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08-11-2018, 01:33 PM
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#9
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Senior Member
Join Date: May 2014
Location: IL
Posts: 1,295
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Hi,
I cured part of my problem by replacing the admittance valve in the bath sink. But l can find no such valve in the kitchen -- only a standard P trap.
So I still get bad odors when dumping. I have tried adding water in the sink and shower as soon as I was done dumping, under the theory that suction might have pulled the water from the traps there. But still no cure...
It's not sulphur smell; I have that pretty well solved with the way I drain my water heater between trips. It clearly is funky sewery and pretty vile.
So I am hoping for some additional ideas that may relate to the original post here.
FWIW.
Rich Phillips
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08-11-2018, 01:45 PM
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#10
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Junior Member
Join Date: Jan 2015
Posts: 17
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I have the same problem. The sinks have p traps and shouldnt let in any order, but i still have it. going to remove p traps and clean them out and replace stock roof vents with the 360 vents. Hope it helps.
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08-11-2018, 01:58 PM
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#11
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Senior Member
Join Date: Mar 2016
Location: N California mountains
Posts: 294
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Quote:
Originally Posted by lesterw
I have the same problem. The sinks have p traps and shouldnt let in any order, but i still have it. going to remove p traps and clean them out and replace stock roof vents with the 360 vents. Hope it helps.
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Yes, p-traps are designed to stop tank odors, but they must be vented to work properly. The vent is located behind the p-trap and in homes it would be vented thru the roof, but in RVs an air admittance valve is used. The valve can fail in two ways, it could stick open allowing tank odor to escape under the sink, or it could stick closed and then the water in the p-trap would be sucked out allowing tank odor up into the sink from the drain.
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2017 Forester 2861DS
towing 2015 Jeep Rubicon
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08-11-2018, 02:18 PM
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#12
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Senior Member
Join Date: Jan 2018
Location: Southern MN
Posts: 477
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I use a liquid treatment for the grey water holding tanks which I add after dumping with a gallon or two of water. I'll do the same with black tank treatment. Not saying you haven't got a vent problem, just a good practice.
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08-11-2018, 02:31 PM
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#13
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Senior Member
Join Date: May 2014
Location: IL
Posts: 1,295
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Hi fobagbob,
I have searched high and low for an admittance valve in my kitchen sink area. Unless they buried behind the wall, I have concluded I do not have one.
But if anyone can point me in a different direction to look, I am open to suggestions.
Still puzzled...
Rich Phillips
__________________
Rich Phillips
2019 K-2500 Duramax Crew Cab
2014 Silverback 33RL
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08-11-2018, 02:49 PM
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#14
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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It's possible that you don't have one. Do you have a P-trap in the plumbing under the sink cabinet? If you don't you may have a Hepvo drain. If you do, then it doesn't require a vent. It's possible that the Hepvo drain has something holding it open and allowing the gases to escape the tank.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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08-11-2018, 02:54 PM
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#15
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Senior Member
Join Date: May 2014
Location: IL
Posts: 1,295
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Hi Bama,
I have a perfectly normal looking P trap arrangement under the kitchen sink, with the outlet pipe going out through the wall. There is nothing that looks like the admittance valve I replaced in the bathroom sink.
This is my fifth trailer (fourth fifth wheel over 20 years), and I have never encountered this odor problem before. Color me perplexed.
Rich Phillips
__________________
Rich Phillips
2019 K-2500 Duramax Crew Cab
2014 Silverback 33RL
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08-11-2018, 03:41 PM
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#16
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Senior Member
Join Date: Mar 2016
Location: N California mountains
Posts: 294
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Quote:
Originally Posted by richp
Hi fobagbob,
I have searched high and low for an admittance valve in my kitchen sink area. Unless they buried behind the wall, I have concluded I do not have one.
But if anyone can point me in a different direction to look, I am open to suggestions.
Still puzzled...
Rich Phillips
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Yours may be like mine, the p-trap outlet under the kitchen sink goes thru the wall into the bathroom and ties into the bath sink drain and there is one air admittance valve under the bath sink serving both p-traps.
__________________
2017 Forester 2861DS
towing 2015 Jeep Rubicon
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08-11-2018, 04:19 PM
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#17
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Senior Member
Join Date: May 2014
Location: IL
Posts: 1,295
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Hi fobagbob,
Well in that case, my new valve in the bathroom didn't solve the problem.
At one point, I also theorized that somehow fumes from the roof vent were being sucked in. But for our recent trip all three vents were closed and plugged with insulating pads because of the Texas heat. So no go on that idea...
FWIW.
Rich Phillips
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08-11-2018, 04:19 PM
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#18
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Camp-N-Nut
Join Date: Jun 2014
Location: Ephrata, PA
Posts: 105
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Where is the air admittance valve for the shower?
__________________
2015 Cedar Creek 34 RLSA
2006 Dodge Laramie Dually Cummins
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08-11-2018, 04:52 PM
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#19
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Senior Member
Join Date: Mar 2016
Location: N California mountains
Posts: 294
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Rich,
To make sure the smell is not from the water itself, have you tried filling a container and taking it outside and smelling it?
Bob
__________________
2017 Forester 2861DS
towing 2015 Jeep Rubicon
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08-11-2018, 04:59 PM
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#20
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Senior Member
Join Date: Mar 2016
Location: N California mountains
Posts: 294
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Quote:
Originally Posted by camp-n-nut
Where is the air admittance valve for the shower?
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If I recall correctly on my unit, the shower p-trap outlet runs to the tank vent line right where the vent leaves the top of the tank.
__________________
2017 Forester 2861DS
towing 2015 Jeep Rubicon
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