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.
When checking these subsystems keep an eye out for evidence suggesting trouble such as sludge or debris in fuel, missing or damaged air cleaner, score marks on top of piston and cylinder walls, and excessive carbon build up on the intake and exhaust valves. All of these give you valuable insight to your problem.
D-42 - Engine Wiring Diagram Specialist
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