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Regarding operation of the 3 onboard fuel pumps, the Aux pump only pulls fuel from an auxiliary source (Jerry Can/Auxiliary fuel tank) and only pumps fuel when the day tank drops to about 1/4 full to refill the Day Tank. The Aux pump does NOT pump fuel into the fuel filters & on to injection...

Not sure I understand your issue...are you saying it won't start & run if you start it in just the "Prime & Run" position that it will only start when you first put it in "Prime & Run Aux Fuel"? It is normal to hear a fast paced clicking if you have the switch in the Aux Fuel position if you...