what it sounds like is you got it down low enough that when you made a hard turn or a hard bump it made what fuel was in the tank splash causing it to suck a small amount of air into the line, but because it picked up fuel again quickly it kept running, i would say dont let it get that low again
mabye have some sediment in the tank? Not noticable on a full tank, due to the dispersion, but with less fuel, not as much dispersion, so its jamming up the pickup, but not enough for it to stop it?
