A system having a multipurpose gas generator for starting a ramjet/scramjet engine and a method for starting a ramjet/scramjet engine are provided to start the ramjet/scramjet engine at a low temperature. A system includes a unit which ignites a combustion device of a ramjet/scramjet engine(14), generates power for vehicle sub system, pumps and previously heats fuel. The unit includes a gas generator(12) which generates gas product used to generate power for vehicle sub system, pump and previously heat fuel, a start turbine(18), a power generator(20), and a fuel pump(26). The start turbine receives the gas product from the gas generator. The power generator is connected to the start turbine and generates the power. The fuel pump is driven by the start turbine in order to pump the fuel. The ramjet/scramjet engine has a plurality of walls and a fuel which is supplied from the fuel pump to a cooling passage of the wall.
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