What is one primary function of a metering helix in a fuel injection pump?

The function of the metering helix in a fuel injection pump is primarily to ensure accurate regulation of fuel delivery to the engine. This helix is designed to control the amount of fuel that is injected into the combustion chamber, based on engine operating conditions. As the engine demands more power, the metering helix adjusts the fuel flow accordingly, ensuring optimal performance and efficiency. This is crucial because adequate fuel delivery directly affects engine performance, fuel efficiency, and emissions.

Controlling engine speed generally involves other components, such as the throttle or electronic control systems, rather than the metering helix itself. The metering helix does not measure fuel temperature; this function is typically managed by separate sensors within the fuel system. While lubrication is important for overall engine health, it is not a role played by the metering helix specifically. Thus, the primary function of regulating fuel delivery stands out as the most accurate description of the metering helix's role in the fuel injection process.