Whats the procedure for "bleeding" the HPOP system?
You think air isnt introduced when you pull the drain plug?
You think air isnt introduced when you pull the filter?
You think their isnt already air IN the engine?
What does the engine do with that air?....It ends up leaving by way of crancase ventilation. Since the oil system is ALL one unit as everyone keeps repeating, isnt it logical that air will work its way out to the crancase?
You would have to leave a ton of air in there for it to not start.