Fuel starvation, who else?

Originally Posted by ChrisSlicks

Yes. I've had it occur on the street with 1/4 tank on an uphill right hander driven aggressively. On a flat auto-x circuit it happens fairly consistently at 1/2 tank with long radius right handlers.

The combination of turning right and climbing seems to be the worst for pushing fuel away from the pick-up. Not very common on the street as it requires sustained lateral G's and heavy throttle.