Probably the same way as the original jet, I'd imagine. The Zwiebel was unreliable in that it used to break from its mounting, then plug the orifice, leading to a flameout. Presumably this is well taken care of in the modern jet - you'd think/hope so. There are other concessions to modernity, such as its main wheel brakes and I noticed the Riedel is electrically started; dunno what might have been incorporated into the engine management system, if anything.