I hooked a voltmeter up to the fuel pump and verified 12V during start and in run position for the short amount of time that the car runs. I disconnected the connector from the wur and tried the car. I thought it seemed to run for another 5s -10s.

The air flap check is with the fuel pump running? Key in run position. When I check air flap for movement fuel will be dispensed? You are looking to see if you can feel the extra 20psi applied on the control piston.
I would not say that the flap moves with the slightest touch. It seems like you have to apply some pressure to get it to open.

When the car runs forcing the air flap open a little bit does nothing. Car just stalls.

With fuel pump running I can hear liquid coming back to the tank.

A while back I had a pressure gauge on it...before and after removing and dissassembling/cleaning the wur. I measured something like 25 then 50. Didnt time it. System pressure was over 70psi with the old fuel pump. I will reinstall the pressure gauge and recheck.

I have realized that some pressure does build up in the tank and I have tried it w/o the cap on.