HOUSTON... We've found the problem! Incorrect assembly of the PULSE FUEL PUMP. Pay EXTREMELY close attention here:
1. The check valves have been damaged during assembly. A notable "dent" is visible in the below image:
Also: The diaphragms must be at the OUTSIDE. You absolutely MUST mate the correct gasket to the center pump body, ON THE CORRECT SIDE OF THE PUMP. Markings on the gaskets and diaphragms clearly show that the gaskets were not on the appropriate/correct sides of the pump body, which will prevent the pump from functioning properly. See below image:
Make absolutely certain that the correct gasket (Items #12 and #13 in your pump diagram) is on the correct side- and that ALL ARROWS on every piece of the pump are all on the same side (stacked atop each other).