had a similar experience last time I did a purge, set up the aux fuel system, then my buddy brett and I hoped in and went to tim hortons for coffee, ran out of purge at tim's, switched back to my tank, and headed for home, purged and cafinated!!!!

Brett and I laughed alot that day about our magyvering, I don't think I even took the wrenches out from under the hood the whole time!