George
It would be nice to have that pressure differential but in the real world as soon as the pump picks up air the pressure drops in the accusump and in a few seconds is equal to whatever the pump is putting out. In a drag car this isn't to much of a problem because most oil pressure problems are when letting off.
In a circle track application oil pressure problems occur just as the driver pitches the car into the turn and plants his foot in the throttle,the accusump and pump soon equalize in pressure and during the time in the corner and coming off the corner the engine is fed oil and air. as the car hits the straight away the pump picks up oil and starts refiling the accusump as well as raising the oil pressure back up. Bill