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Old 10-23-2014, 12:15 AM   #1
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Sewer smell

I have a strong sewer smell comming from my kitchen sink. Have replaced vent cap.
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Old 10-23-2014, 02:11 AM   #2
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Hello and We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy our website and forums. Good luck, stay safe and keep us posted.
Did you look for a vacuum breaker under the sink/cabinet area? Could it be the possibility the house batteries are in the same area and off gassing odors area deceiving you? Please give us as much information; yr/make/model of your coach and any phtos that might help us help you. Thank you.
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Old 10-23-2014, 08:13 AM   #3
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Welcome to IRV2! We're sure glad you joined the gang here!

Hope you get your problem solved! Enjoy the forum!

Good luck, happy trails, and God bless!
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Old 10-23-2014, 08:16 AM   #4
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Make sure you run water in both sinks, just in case the P-traps are dry.

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Old 10-23-2014, 08:37 AM   #5
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Quote:
Originally Posted by jld1952 View Post
I have a strong sewer smell comming from my kitchen sink. Have replaced vent cap.

The "air admittance valves" used in under sink locations in motorhomes are a high failure item. It's the dead end pipe sticking up close to the bottom of the counter top. It's a screw thread attachment. Likely the one you have is cheap and there are better versions available. Lowes or HD stock them.


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Old 10-23-2014, 11:28 AM   #6
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Hello and We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy our website and forums. Good luck, stay safe and keep us posted.
Did you look for a vacuum breaker under the sink/cabinet area? Could it be the possibility the house batteries are in the same area and off gassing odors area deceiving you? Please give us as much information; yr/make/model of your coach and any phtos that might help us help you. Thank you.
Its a 1996 fleetwood Bounder. The batteries are in front of the engine.By vacuum breaker, do you mean the vent cap with the spring loaded rubber seal.The smell comes from the kitchen sink area, but not the bathroom sink.
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Old 10-23-2014, 11:39 AM   #7
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You may need to drain your hot water heater.
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Old 10-23-2014, 11:55 AM   #8
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Did you look for a vacuum breaker under the sink/cabinet area? Could it be the possibility the house batteries are in the same area and off gassing odors area deceiving you? Please give us as much information; yr/make/model of your coach and any photos that might help us help you. Thank you.
RV Wizard
"Vacuum breakers" are used in fresh water lines, (not in sewer drain lines).
I believe you mean "air admittance vent", (aka: "mechanical vent"). ??
Confusing terminology is confusing.
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Old 10-23-2014, 05:05 PM   #9
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Thanks everyone. I didnt know the gray water tank was also vented out the roof, lots of spider webs, so run water down it. Hope that works.
Thanks
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Old 10-23-2014, 06:47 PM   #10
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By vacuum breaker, do you mean the vent cap with the spring loaded rubber seal.The smell comes from the kitchen sink area, but not the bathroom sink.
There should be one of those devices under each sink, usually called plumbing vents in the home supply stores.

If you aren't sure just what is needed, there are instructions with pictures if you visit this link.
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Old 10-24-2014, 04:17 AM   #11
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[QUOTE=jld1952;2281670]Its a 1996 fleetwood Bounder. The batteries are in front of the engine.By vacuum breaker, do you mean the vent cap with the spring loaded rubber seal.The smell comes from the kitchen sink area, but not the bathroom sink.




Yes, the vacuum breaker is the spring loaded valve at the short drain riser under the cabinet. Since the batteries are not in the vicinity, I would suspect the vacuum breaker needs replacing.
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Old 10-24-2014, 07:19 AM   #12
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[QUOTE=RV Wizard;2282616]
Quote:
Originally Posted by jld1952 View Post
Its a 1996 fleetwood Bounder. The batteries are in front of the engine.By vacuum breaker, do you mean the vent cap with the spring loaded rubber seal.The smell comes from the kitchen sink area, but not the bathroom sink.
Yes, the vacuum breaker is the spring loaded valve at the short drain riser under the cabinet. Since the batteries are not in the vicinity, I would suspect the vacuum breaker needs replacing.
As stated in an earlier reply:
"VACUUM BREAKERS are NOT used in sewer drain systems"! .....(Vacuum breakers are used in pressurized water systems to prevent the contamination of the water supply).

The spring loaded valve at the short drain riser under the cabinet is an "air admittance valve", (aka: "mechanical plumbing vent").

This is a pic of an AIR ADMITTANCE VALVE:

-----------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------

These are VACUUM BREAKERS:



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Old 10-24-2014, 01:17 PM   #13
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I'm curious as to what the air admittance valve actually does and how can one determine that replacement is needed? I too have a "weird" odor in our coach which we simply cannot identify. There appears to be nothing unusual coming from the sinks. Getting ready to do the water softener, detergent, bleach treatment for both black and gray tanks.
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Old 10-24-2014, 01:29 PM   #14
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I'm curious as to what the air admittance valve actually does and how can one determine that replacement is needed? I too have a "weird" odor in our coach which we simply cannot identify. There appears to be nothing unusual coming from the sinks. Getting ready to do the water softener, detergent, bleach treatment for both black and gray tanks.
Wbonsell
Air Admittance Valves (AAVs) are negative pressure-activated, one-way vents, used in a drainage system to eliminate the need for passive pipe venting and unsightly, costly roof penetrations.
See: http://www.diydata.com/plumbing/air_...ance_valve.php

IF AAVs are used in your RV and IF the "seal" fails in one.... odor from the sewer tank can/will enter the living area of your RV.
Normally they are inexpensive and easy to replace.
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