Over-priming ?
Whoever primed a Goblin before start-up? Or a Ghost for that matter - "LP and HP cocks on, throttle closed, press button" and off yer goes (or not if it don't light or if the Ghost starter cartridge only gives off foul-smelling clouds of greeny-grey, calling for a rapid (ie QUICK) winding shut of the canopy and possibly some deep breaths of 100% oxygen) ...