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Under low power settings, the difference in pressure created by the venturi is insufficient to accomplish consistent regulation of the fuel. A constant-head idle spring is incorporated to provide a constant fuel differential pressure. This allows an adequate final flow in the idle range. 

## Fuel Metering Section 

The fuel metering section is attached to the air metering section and contains an inlet fuel strainer, a manual mixture control valve, an idle valve, and the main metering jet. [Figure 2-34]  The idle valve is connected to the throttle valve by means of an external adjustable link. In some injector 

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models, a power enrichment jet is also located in this section. The purpose of the fuel metering section is to meter and control the fuel flow to the flow divider. [Figure 2-35]  The manual mixture control valve produces full rich condition when the lever is against the rich stop, and a progressively leaner mixture as the lever is moved toward idle cutoff. Both idle speed and idle mixture may be adjusted externally to meet individual engine requirements. 

## Flow Divider 

The metered fuel is delivered from the fuel control unit to a pressurized flow divider. This unit keeps metered fuel under 

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