Huh. I know nothing about the Borgeson box. The factory box has the pressure inlet closer to the input shaft side, opposite of what you appear to have. But they couldn't be backwards or the fitting 180* out?
Edit - Borgeson website shows return port close to input shaft. So it's not that. Something is clogged or air bound.
Thanks for your input. Been troubling me lol. Fluid was moving theough the lines i know because I could see the low pressure return line sending fluid back and forth.
Literally would move, I’ve never messed with power steering before so all is new to me.