I know this subject has been discussed many many times. We have a 2011 Zinger ZT25. On a trip, last year, we got the black tank odor in the camper after traveling some distance. I know, I know, nothing new!! It happened a couple of times but then went away on future trips. This Spring I installed one of those rotating vent caps that provide suction at the top of the vent pipe when driving. First two trips, no smell. Last trip, smell again. Seems to happen only when I travel with a tank that has not been dumped while on my way to a dump station some miles away. I've checked the drains and they are not dried out. We just finished a weekend of camping and all drains had been used. We had not just dumped so didn't suck out the traps of water. Toilet had water in it so the smell could not have come out of there.
What am I missing?
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