Andrew
Avgas will also vapour lock, and given the right circumstances, say your typical Bonanza, parked out on the ramp on a 35-40 degree day, even better with dark paint or boots. Full tanks. Nice and warm.
Take off, and climb, so the angle from the wing pick up top the engine is even further up hill, and passing through 7-8000 feet you get stumbles..... Bingo! Every time. And you think it can't happen with AVGAS
And yes, this is not abnormal!
Now on a 206 for example it is less of a problem due to the gravity feed, but it is still possible with the TC machine you have. Just a bit harder to achieve.
Cheers
