Power steering pump not sucking fluid

Just replaced the PS pump in a 05 Yukon Denali with a remanufactured one. During the bleeding process, lock to lock many times with engine off, the resevoir on the pump never seemed to suck down any fluid.

After replacement the power steering and brakes no longer work. This vehicle does have a hydroboost unit. Prior to replacing the pump the steering and brakes did work.

The reason for the pump replacement is there was a leak somewhere, and on a few occasions the vehicle was driven with no PS fluid which assuming damaged the pump.

My question is, does this sound like a bad remanufactured pump or are there other components I can check?