For those interested, that black cap/nose thing is its starter motor. It'll spin the engine up to about 25,000/29,000rpm - whereafter the engine itself takes fully over ('fuel ramp').
That little glow-plug looking thing is exactly that, and has its own fuel supply - it vaporises the fuel for initial start-up. The fuel pipe going into the actual purple shroud is the main fuel supply that kicks in during fuel-ramp.
It's all controlled by two main valves, which are in turn controlled by an ECU - called a FADEC - Full Authority Digital Engine Control.
The latest Wren and Jetcat engines have all of this internalised - making for only one fuel supply line needed, a fully internal glow-plug, fully internal valves, fully internal EGT sensor, and brushless fuel pump and starter motor.