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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved