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Old 07-20-2015, 08:21 PM   #1
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Southwind sewer smell

We have an 06 32VS, and have a sewer smell every time we flush and are traveling down the road, but never when we are parked. I put a cyclone vent on top, but no help. The vent pipe is only about 12" from the bathroom vent, good engineering. We have closed all vents and windows when flushing, but we are still getting the smell. There is water in the p traps, and i have checked the vent under the sink and it seems to be working. We are frustrated.
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Old 07-20-2015, 08:35 PM   #2
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Flushing while traveling can create negative pressure if any window or vent is open even a crack. Are you sure the Cyclone vent and the pipe to the black tank isn't blocked? Only additional suggestion is to use a scented tank additive to suppress the odor.
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Old 07-20-2015, 09:08 PM   #3
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We do use a tank additive. I think you are right about the negative pressure, but just can not figure out why or how it is being created.
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Old 07-20-2015, 09:31 PM   #4
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I have read that sometimes the vent pipe will come loose and physically drop down too low in the tank. (Not sure I'm explaining that clearly.) This prevents it from venting correctly.

Good luck; chasing odors can be frustrating. The syphon roof vents worked well for us.
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Old 07-20-2015, 10:42 PM   #5
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You can take a hose on your roof and run some water down the black tank vent if you have any obstruction it should clear it out, if you have a very powerful flashlight you may be able to see all the way down the vent. Some people have better luck with the 360 sewer vents. I use the Camco spinners which really work on my rig.
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Old 07-21-2015, 07:59 AM   #6
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It has been this way since the first day we bought it, so maybe something is wrong with the way it was assembled. It doesn't make sense that it only smells when we are on the road and not when we are parked.
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Old 07-21-2015, 11:04 AM   #7
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Does your RV have washer/dryer connections? I have read that those p-traps can be a source of odor, too. (Though I can't imagine why it would smell on the road and not parked.) If you do a forum search on black tank odor you will find pages of threads on the topic. I think most times its a vent issue of some kind.
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Old 07-21-2015, 08:08 PM   #8
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thanks SarahW.
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Old 07-25-2015, 12:37 PM   #9
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I had odor issues on our last trip. Found the smell to be from the gray tank coming up through a very loose air admittance valve under the kitchen sink.
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Old 07-26-2015, 06:59 AM   #10
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In case you haven't tried this, be sure to put the plugs in all of the sinks while travelling.
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