Having difficulty sourcing hexane, I have been using an equivalent of Coleman lantern fuel in my Packard pilot. According to Coleman's MSDS at [www.coleman.com
] , it is a mixture of cyclohexane, nonane, octane, heptane, and pentane. 5, 6, 7, 8, and 9 - must be everything you need! Around here it is called "naphtha gas" and is fortunately still in broad enough use by the Amish community for lighting that I can dispense it into 5-gallon jugs.
My pilot reliability seems to be slightly improved by using carbureter cleaner to squirt through the jet and clean the nozzle every 20-30 hours of use. Perhaps straight hexane would be even cleaner than that.
There's more on naphtha at [en.wikipedia.org