LG, no we haven't. I guess most of the trouble shooting was with the assumption that we lacked pressure (i.e. some sort of blockage or restriction. Allen, "the issue" happened once, briefly shortly after the first test drive, then basically a catastrophic failure 2 weeks ago. It was hot both times, but now it persists, hot, cold, in between. Checked timing, replaced electric fuel pump, fuel filter, ran carb cleaner through, pretty much everything suggested above.