Thanks for letting me know the proper psi! He had it sitting at 40!! Turned it up to 65 now.An 01 engine you need electric fuel. Interesting spot for the 7.3 electric fuel pump mount. It does have a fuel regulator just behind pump, looks to be an Aeromotive which is a quality product as are the look of the fittings and fuel lines. What I’d do is follow the fuel line towards the tanks to see if there is a filter system in line. Also I’d check to see if there is a return line as there’s should be a return from the fuel regulator back to tank.
Lastly I’d put a gauge on the regulator and check what fuel pressure you’re getting at idle, should be 65-67 psi. Also clean up the electric wiring harness to E fuel pump and ensure it has a fuse to protect from shorting.