doesn,t need to be running to bleed air out of oil line to pump, it will gravity bleed,only needs to run to bleed air out to banjo valves. you can also bleed the line to carbs,wire the oil pump wide open ,run at idle,she should smoke something fierce,and look for bubbles,don,t imagine there will any though
DO NOT BLEED WITH ENGINE RUNNING - Could cause damage.
Gravity should be sufficient, but if it isn't take a rag and a compressed air hose and put pressure in the oil tank, this will force the oil to go through the lines. Never run then engine when it's not getting oil.
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