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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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