The Emulsion Tube/Main Jet sits below the fuel bowl. This results in the emulsion tube and main jet to constantly have fuel pressure against it. The original design relies on the mating surfaces between the carburetor body and the main jet/emulsion tube to be perfect in order to provide a seal between each other. As corrosion and age set into your carburetor, this seal is often compromised. Since fuel is always being pulled down toward the main jet area, fuel will continuously leak out causing an overly rich air/fuel mixture, and loss of fuel.
They are heavy. In most applications today their power to weight ratio is not considered impressive. But when they power 4 wheeled machines such as Lawn and Garden Tractors, Skidsteers, and Road Grading Machines, you want that weight to aid in delivering that power to the ground.
D-42 - Engine Wiring Diagram Specialist
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