To answer your question as to how it works -- it is actually quite complicated . Gas is sucked up a straw with a fine screen on the end - through a gas pump that uses crankcase pulsations to do the work -- then it flows into the little cup you mentioned -- excess is spilled out of a hole in the upper part of the little cup . This is how they regulate the gas level in the cup -- like I said excess spills back into the tank . Another straw with a fine screen is positioned in this little cup and the venturie (vacuum) action draws gas up past the needle adjusting screw and finally into the air flow. Problems with this set up include the two screens becoming corroded and plugged . The gas pump consists of a diaphragm made from a rubberized type of material that goes so hard over time exposed to the e 10 gas that it simply cant flex any more and of course slowly gets harder and harder to keep running. This set up also makes these engine very difficult to start when the little cup loses its charge of gas through evaporation or tiny rust holes in the bottom . You have to crank the engine many times to pump the cup full again. Easiest way to get around this is to prime the engine with a little gas by removing the air filter or spark plug . Some body did sell a primer bulb that was built in to the gas cap. It would pressurize the gas tank some what and force gas up into the little cup making the engine easier to start .
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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