your preparation sounds different than what i did, which i tried to do following their directions. Empty, let the air down to about 7 psi in the A'sump. This is what becomes much higher pressurized when it is hooked up to a motor's pressure. Then, with the arrow pointing away from the A'sump, hooked it up. So, on my car, when i put electricity to the A'sump, it opens the valve, and the pressurised
oil flows to the motor. It will fill if i turn the electricity off, as the electric valve has a one way inlet, if the power is off. With my engine running, the A'sump
oil pressure gage will read the same as my engine's
oil pressure gage, then if i turn the A'sump off, it holds the pressure until i want to pre-lube the motor before starting it.
I miswired it the first time, are you sure you actually have power when you think you should?