Dual-pump fuel system and method for starting a gas turbine engine

摘要

A dual-pump fuel system (10) for use with a gas turbine engine (12) comprises a fuel metering system (22,24), a mechanical fuel pump (18), an electric fuel pump (20) and an engine controller (14). The fuel metering system is configured to dispense fuel flow to the engine based on operational needs of the gas turbine engine. The mechanical fuel pump is configured to deliver fuel to the metering system dependent on operational speeds of the engine. The electric fuel pump is configured to deliver fuel directly to the engine independent of operation of the engine. The engine controller is connected to the metering system and the electric fuel pump and is configured to cause the electric fuel pump to deliver fuel to the engine to start and operate the engine until the engine operates the mechanical fuel pump to deliver fuel to the metering system sufficient to sustain operation of the engine.