Kerosene with a splash of gasoline and some heavy oils and tars left over from incomplete refining.
Before hydro cracking of fuels became standard at refineries the distillate was the remains of the crude that did not refine out easily into the other fuels. It was what was left overs that were too expensive to refine further. It also did not burn completely in the engines. The reason for the two or three check valves on the oil pan is so that after sitting overnight the bottom valve could be opened and drain off the unburned fuel after the heavier oil had chance to settle. After draining to the lower level another quart of oil was add to refill the oil pan.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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