There will be a vent running from your black tank all the way up to the roof of your unit. Make sure the cap is in place and free of obstruction. Also, is your toilet seal holding water in the bowl? If not, either put some plastic gloves on, turn the water off, and clean the seal. If the seal still will not allow the bowl to hold water then replace it.
Also, by running the bathroom ceiling vent fan, or fantastic fan, you will tend to pull odors out of your black tank if your toilet seal isn't in perfect condition. You may think you are venting your stinky bathroom but in fact could be creating the problem.
Next time you empty your black tank make sure you flush it several times. Keep flushing it until the water runs out completely clear. Remember to always add extra water with each flush cycle. We hold the pedal down for at least a count of 5 each time to make sure we are getting plenty of water in the tank.
Hope this helps.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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