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Old 10-11-2016, 08:18 PM   #1
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Gray water smell on road

We have a 2006 American Traditions and have a smell that is driving me crazy,if you have dumped the tanks the odor will come, can't find a leak or any bad drain vent checks valves, it also infiltrates the basement area if the roof vents are used on higher speeds,I 'm pretty sure it's not black odor,any ideas Greatly appreciated,I close sinks add water to the bowls,cover shower drain , tried not using max ac on dash,if it's been unused several weeks it is likely not to bother me as bad, got to be so simple I can't see it,filled both tanks completely with soap water before this trip and flushed before leaving no help.
Thanks in advance
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Old 10-11-2016, 08:33 PM   #2
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Originally Posted by hardint View Post
We have a 2006 American Traditions and have a smell that is driving me crazy,if you have dumped the tanks the odor will come, can't find a leak or any bad drain vent checks valves, it also infiltrates the basement area if the roof vents are used on higher speeds,I 'm pretty sure it's not black odor,any ideas Greatly appreciated,I close sinks add water to the bowls,cover shower drain , tried not using max ac on dash,if it's been unused several weeks it is likely not to bother me as bad, got to be so simple I can't see it,filled both tanks completely with soap water before this trip and flushed before leaving no help.
Thanks in advance
hardint
If your coach has them, have you checked or replaced the AAVs, (air admittance valves), in the gray water drain pipes?


1-1/2" AIR ADMITTANCE VALVE

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Old 10-12-2016, 10:01 AM   #3
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Thanks for the response and no not replaced, took all of them off and blew thru them backwards and the check valves all seemed to work but it could be the problem as they are 10 years old,unit has 15000 miles and garage kept, But ??? Cant understand the smell in the basement , not the dump valve area, no wet spots or water dripping from the ceiling of the compartments, I have one of the new fangled aero vents but hadn;t got installed yet,there has to be a simple answer, I will buy the AAV's as soon as I get somewhere.
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Old 10-12-2016, 11:22 AM   #4
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I replaced the automatic vent vales under the kitchen sink and the bathroom sink. They're cheap and it's easy to do just use Teflon tape to seal the threads. We were having a problem with the smell and I tracked it down to now water in the p trap coming from the washer. Poured a bunch of water down the drain and the problem went away. So I would suggest that you fill all your p traps and see if it's still doing it. The one for our washer (a Splendid) was accessed from the compartment above it. My wife keeps a bunch of stuff up there and it's a pain to have to remove to access the vent. So I think I have figured out a way to run some tubing down the drain pipe and be able to fill the p trap with water without having to remove all the stuff from storage.
Running the washer will do it but we often spend month or more at a time boondocking so running the washer is a pain.
Good Luck
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Old 10-12-2016, 11:27 AM   #5
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Don't forget the the washer/dryer has a drain vent and a P-trap as well.

Sometimes when driving the water in a P-trap gets sloshed or sucked out and that can let odors in as well.

Some other possibilities include battery gases (usually indicates a failing battery) or a dead critter behind a cabinet or wherever. Either of those can produce odors that are very similar to "sewer gas" smell.
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Old 10-12-2016, 12:36 PM   #6
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Close your roof vents when on the road. There is enough of a vacuum created to suck smells out of any leaky joint in your black and gray water systems - and with that you will get smells. Roof vents should only be opened when parked.
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Old 10-12-2016, 09:27 PM   #7
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Thanks for the replays, after removing and cleaning all 5 AAV's by pulling the rubber check valve out of it, with fans on a windows open today no smell then AC on and no smell. Test going home Monday, the AAV in the little wall door in the bedroom for the shower water valve access and it was gunked up. Hopefully it will be a temporary fix , here is a unique replacement link ,pricey but probably much better design over time.
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Old 10-12-2016, 11:50 PM   #8
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The water in the P-trap for the washer has dried up. Happens in our coach every once in a while.

Run the washer through a short cycle and you'll fix this.
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Old 10-13-2016, 11:09 AM   #9
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Quote:
Originally Posted by Gary RVRoamer View Post
Don't forget the the washer/dryer has a drain vent and a P-trap as well.
Sometimes when driving the water in a P-trap gets sloshed or sucked out and that can let odors in as well.
Some other possibilities include battery gases (usually indicates a failing battery) or a dead critter behind a cabinet or wherever. Either of those can produce odors that are very similar to "sewer gas" smell.
Gary RVRoamer

The odor of "gassing batteries" is often misinterpreted as "sewer smell".
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Old 10-13-2016, 11:12 AM   #10
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Gary RVRoamer

The odor of "gassing batteries" is often misinterpreted as "sewer smell".

X-2 beat me to it.
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