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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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.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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.
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.
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.