Thanks Icon and McDave. I think I will get the vent cap. I have had trouble with the traps drying up and gray water tank smell in the camper while setting. That is a different smell than the black water, but I have now connected the gray water to the black water vent stack. I do periodically pour water in the sinks and shower to fill the traps when I think of it. All the more important now with the black water vent connection
You guys gave me some things to think about. I'll start with the vent cap which seems like a good idea in any case based on reviews.. then work backwards. The odd thing is that I have made no changes since my trip to Georgia two months ago and I didn't have the issue which is why I am thinking I developed a leak. It is possible I had a window cracked open slightly and didn't realize it or etc..
This problem stinks! :-)
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