Both may be right. The fuel lines are sized for liquid propane and may run the engine lean from fuel starvation when on vapor only. My pickup truck with IMPCO brand dual fuel conversion starts better on liquid than on vapor. The fuel tank does not even have a vapor tap, but when I run the tank below 5%, the fuel dip tube can no longer reach the bit of liquid propane in the bottom of the tank and must run on vapor. Under those condition, a cold start involves a lot of cranking, a few lean spits through the carb, and will stall 2-3 times before it finally idles on vapor. The only downside to starting on liquid in cold weather is that you need to allow the engine to idle a bit to heat the coolant to keep the vaporizer working at making propane vapor from liquid propane.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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