1990 Ford Bronco EFI regulator

Engine Mechanical problem
1990 Ford Bronco V8 Four Wheel Drive Automatic

My 1990 5.8L V8 bronco is not starting. There is no fuel pressure when the bleed off valve is depressed. When the pump is activated it sends healthy volume of gas through the filter but never all the way to the injectors to start the truck. Is this a fuel regulator problem? A clogged or leaking injector? Seal problem? And when can I find a diagram of where the lines are run I cannot find the return line to pinch to see if the regulator is stuck open.