FR1 = Measure the right amount of fuel for each
combustion cycle.
FR2 = Evaporate fuel.
FR3 = Measure the right amount of air (oxidizer) for
each combustion cycle.
FR4 = Mix the vaporized fuel with the oxidizer.
FR5 = Inject the mixture into the combustion chamber
at a preset pressure.
FR6 = Ignite the fuel/oxidizer mixture.
FR7 = Deliver the power.
FR8 = Exhaust the combustion product