Might be similar to our M25XP.
With the key on to activate the 'Facet" electric lift pump, I could hear the soft clicking of the lift pump holding pressure, and then open the knurled little valve knob right by the high pressure pump, and this would let fuel fill up the system/filter housings to that point and be routed back to the tank.
After a minute, close that valve and the clicking of the pump almost stops.
Only unpleasant part is also listening to the irritating buzz of the 'low oil pressure' alarm, since the engine is not operating even tho the key is 'on'..
At that point, go ahead and glow plug for ten seconds and hit starter button. Should run fine. Usually, unless there is still some air in the line......