First things first...
I am not familiar with that model, but glanced at parts catalog.
It apparently uses a Roosa-Master injection pump with an electric shutoff.
Is there power to the terminal on top of the injection pump when the key switch is "ON"?
If there's power, have a helper cycle the key slowly while you listen at the I.P., there should be a noticeable metallic "click" inside the I.P. as the fuel solenoid cycles.
If OK there, loosen bleed plug on top of rear filter, does fuel come out?
Do the same with the front filter.
If no fuel flow, replace clogged filters or figure out what's restricting fuel flow.
If fuel flows, remove the fuel return line from the top of the I.P. (near the fuel solenoid wire on top of the I.P.), then remove the fitting it attaches to from the pump cover and look for dark "coffee grounds" debris stuck in the opening of the fitting.
If there's debris there, the plastic governor damper ring deep inside the I.P. has failed from heat and age, and broken up, clogging the return. (Not all RM pumps have this, so it may not apply.)
If fitting is clear and open (or not), crank the engine with the fitting removed and there should be a slow flow of return fuel, and possibly air. Does the engine now begin to smoke and maybe start?
If there's a small flow of fuel and no smoke or start, loosen a couple of injector lines to bleed air out of the lines, head and rotor.
Any fuel spray there after bleeding? (WARNING, keep body parts away from any high-pressure fuel spray!)