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Ah ha..... I'm not the only one with this problem, I have a '55 Ford 850 LPG, and below 30, usually in the 20's is when it does not like to run for long, it will start sometimes, but it does not like the cold temperature. From what I understand about propane is that it liquifies at cold temperatures, so it seems I'm not getting vaporization, or vapor at all, but these temperatures are not cold enough to cause liquification, I'll post a link to an interesting site on propane. Boiling point of propane is some really cold temperature, the link below has some interesting information on propane. This 850 has an Impco regulator/vaporizer on it, with coolant lines runnning coolant through it, it frosts up in the lower temperatures, and I'm thinking that before the thermostat opens and lets hot water through, the fan is pulling cold air in and blowing it directly on the reg./vap. further cooling it before things get heated up enough in the vaporizer. I've got to educate myself on this kind of a fuel system, as this may just be an incorrect assumption. Also I've got to look into the carb on mine, ( did you say choke ? ) LOL, never used a choke on an LPG engine, even in the cold, if I remember correctly. I was stumped by this, as the forklifts in the lumber yard always were left in the cold warehouses at 0 deg. F or less, and they usually started and ran with little trouble. I solved the problem, since last year, the old 850 goes into the heated garage, ready to go now, just put inside tonight. I am curious to see what can be done to make cold starting easier I've kept my 30 lb. tank inside, makes a little difference, but it's got to be something to do with the Impco reg./vap. I do like the LPG, oil stays really clean, the tank looks a little unsightly but overall it's not bad, no one wanted this tractor because it was LPG, it was for sale for quite some time before I bought it.
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