Carburetor Basics WM 80 Repair
48 wc_tx000522gb.fm
Fuel Metering
There are four components of the fuel metering system: the metering
diaphragm (a), the metering lever (b), the spring (c), and the inlet
needle (d).
The metering lever transfers the pressure of the spring to the inlet
needle, holding the inlet needle closed and preventing fuel flow. When
the metering diaphragm senses a vacuum pulse from the engine, it
moves inward toward the carburetor. This action moves the metering
lever, which in turn, lifts the inlet needle and allows fuel to flow into the
metering chamber.
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