The atmospheric vent is divided by the two halves of the carburetor. As a result fuel can leak in between the gasket and flow into the atmospheric vent and down into the carburetor. This also causes loss of fuel and a rich air/fuel mixture. The fuel level needs to be slightly below the bottom half of the carburetor to prevent this. Warping of the carburetor halves can also create an easier path for fuel to leak into the atmospheric vent.
I hope this basic explanation of tractor wiring helps you make sense of the tangled mess in your tractor. This was just a basic overview of wiring concepts. You can add additional components to your tractor such as safety switches, fuses, ammeters, hour meters, indicator lights, etc. They all will be wired in a similar fashion to above. The most important concept to remember is you need a closed loop or circuit to have electrical flow, and it’s best to visualize your wiring in separate circuits.
D-42 - Engine Wiring Diagram Specialist
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