When you install the Accusump, you fill it with
oil, so your entire oiling system now has 2-3 quarts (depending on what size you got) more
oil in it. Most of the extra
oil is stored in the Accusump. When you oil pressure is low, the Accusump release oil, so now you have more oil in the pan then normal, until your oil pressure goes back up and re-pressurizez the Accusump.
The electric valve is controlled by a toggle switch, but it's not automatic. You have to flip the toggle switch on when before you start your engine (to pre-lube), then flip the switch off before you shut down.
Pete