- A metered fuel in a high-pressure fuel pump used to control pump output depending on the mass flow and such other factors. This intermediate metered fuel is used to control the opening of the flow control unit. The servofuel acts as a fluid to control the fuel flow. The pressure of the servofuel is varied by controlling the rate of the fuel at the end of the servoline.
Aviation dictionary. 2014.
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overspeed governor — A device to protect the engine against overspeeding. The servofuel is bled off when the governed engine speed is reached. The two types of governors are centrifugal and hydromechanical. The illustration shows the propeller governor for an oil… … Aviation dictionary