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03-26-2016, 10:04 AM
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#1
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Junior Member
Join Date: Jan 2015
Location: Santa Fe Springs, Ca.
Posts: 3
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Sewer smell coming from under sink.
Keystone passport 2013 2910bh. Experiencing an unusual sewer smell from under the kitchen sink. Could the black tank be backing up into the grey water lines? I don't think they are connected. Haven't took the traps off to see what's going on because we are camping for spring break. Don't feel like working on vacation. Any input would be helpful. Thanks.
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03-26-2016, 10:13 AM
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#2
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Site Team
Join Date: Mar 2009
Location: Fraser Valley BC Canada
Posts: 7,015
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Sometimes, this odor is caused by a malfunctioning "cheater vent" which takes the place of the usual galley holding tank vent. Look under your sink and you may see a black PVC pipe with a spring-loaded cap on it. The cap may have worked its way loose or the mechanism inside has failed.
These cheater vents are often easily purchased at HD or some other big box store and are simple to replace.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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03-26-2016, 10:32 AM
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#3
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Senior Member
Join Date: Apr 2015
Location: Stafford, CT.
Posts: 269
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Same as above, but I'll add if you are hooked up to the sewer, keep your dump valves closed until your ready to dump. This will prevent any of those gasses from coming back up into your trailer.
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Jason & Wendy
2014 F350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16k fifth wheel hitch
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03-27-2016, 07:25 PM
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#4
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Senior Member
Join Date: Apr 2013
Location: Green Valley, AZ
Posts: 782
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It had happened to me and it is that vent under the sink, used instead of an air pipe going up to the roof. It's a five minute job and $20 part. It's called an Air Admittance Valve.
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Earl
2007 33.5' Arctic Fox Fifth Wheel used for full-timing for several years--now sold
2011 Hideout 23RKSWE that we now use for poking around local parks
2007 Chevy 3/4 ton diesel with Prodigy Brake Control
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03-27-2016, 07:33 PM
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#5
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,996
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The easy way to determine if it's the "cheater vent" that's actually allowing the smells to enter is to take a plastic sip lock bag, slip it over the vent and tape it to the pipe. If the smell persists, it's not the cheater vent, but if the smell goes away, replacing the vent will fix your problem.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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04-12-2016, 08:47 AM
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#6
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Member
Join Date: Feb 2016
Location: Tulalip, WA
Posts: 41
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Quote:
Originally Posted by JRTJH
The easy way to determine if it's the "cheater vent" that's actually allowing the smells to enter is to take a plastic sip lock bag, slip it over the vent and tape it to the pipe. If the smell persists, it's not the cheater vent, but if the smell goes away, replacing the vent will fix your problem.
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Don't forget to remove the bag and replace the Air Admittance Valve. If you don't the next time you dump the gray water tank you stand the chance of the outgoing water flow will produce a suction on the drainage system which will suck the water out of the P-Trap under the sink and the sewer gas smell will really be strong. The water in the P-Trap keeps the smell out by providing a water seal.
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Scott
Retired Plumber, Building & Plumbing Inspector, Stormwater Drainage Inspector.
2013 Mountana Montaineer 375FLF
2011 Open Range Roamer 281FL
2013 Chev Silverado 6.6 Duramax
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04-12-2016, 09:05 AM
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#7
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,996
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Quote:
Originally Posted by Elk4me
Don't forget to remove the bag and replace the Air Admittance Valve. If you don't the next time you dump the gray water tank you stand the chance of the outgoing water flow will produce a suction on the drainage system which will suck the water out of the P-Trap under the sink and the sewer gas smell will really be strong. The water in the P-Trap keeps the smell out by providing a water seal.
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Yup, YUP !!! Any time you use a "Band-Aid fix" to check something, ya gotta remember to "undo the Band-Aid" after you verify the condition !!!
That said, I wonder if the OP ever resolved his problem???
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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