Generally the rule is start on vapor, warm up the engine lightly loaded, then open the liquid valve and close the vapor valve. That's because the ordinary 30 or 40 gallon propane tank can't gather enough heat from the air around it to evaporate liquid at the rate the engine needs at full load. My multifuel standby generator needs two 100 pound bottles to evaporate enough for 5 KW.
If you don't load an engine much, it could run on vapor all day, plowing or working it hard its going to need to be on liquid with the vaporizer working to give gas to the carburetor. Else it will run lean and too much running lean can burn the exhaust valves.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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