good suggestions above. I use the 2 quart model. I did have the first solenoid on the electric valve go bad, i had inadvertently wired it to always on, not just on with the switch i put in, so it burned out in a month or so.
Are you sure you have the valve pointed the right way? the little tiny arrow points away from the A'sump. I bled mine when new down to about 7 psi, then it will fill to read about the same as my engine's
oil pressure mechanical gage does. When i turn on the switch to pre-
oil, i can hear a gurgling sound as it pushes
oil into my motor, at my filter block adaptor. My pressure rises to about 20 psi, and slowly bleeds down.
Are you using a check valve, it may be in wrong way, i don't use one. You might slighly loosen a fitting, and see if it leaks oil when discharging at pre-oil, and try running a power line directly from the battery to the switch on the Asump. , in case you are not accurately powered, i wasn't for several months at first.
My guess is that you are not actually powering the switch, so it fills but won't discharge.
please report back.