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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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