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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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