If the valve is open all the time all the extra oil is in the motor when shut off. As soon as the oil pressure reaches the pressure you have the accumulator set at (12 on mine) it pulls 3 quarts or whatever size you have back in the accumulator. If mine oil pressure drops below 12 it starts pumping oil in to maintain 12 psi.
I choose to turn mine on and off so my motor has oil pressure before I crank it. Lots of folks do it this way and the way John G does it
They also make and electric switch to turn it off and on when a switch is cut off or on.
ratedX said:
That's how I'm seeing it too and if it's open that means there's 9 quarts in the pan at start up
Correct