[Jamesp]

I'm not versed enough in the fuel system to know that this is correct, but it sounds a whole lot like a pump problem, pump not running with startup power and zero fuel pressure. That said, you are using and AC Schrader fitting to measure the fuel rail pressure and the AC Schrader fitting may not depress the valve core in the fuel rail Schrader valve sufficiently to allow a pressure reading. One way to find out is to depress the Schrader valve core to see if fuel comes out. If the system is up to pressure the pump may not run when the key is initially turned on.