Sunka, you don't understand the issue. We've apparently failed at explaining why you're wrong. However, the failure may be only in our wording, not that you're wrong.
The vapors are what trail behind the plane. The air flows into the gaping hole in your wing, mixes with the trapped vapor and remaining puddles of avgas in the tank, and flows back out.
It's very plausible that the trail (a trail, any trail) would continue from the airframe even after the fuel tank was unusable.