Chevrolet Repair: diesel engine, pump fuel, injector pump

Question
94 3500 diesel engine won't start after leaving it for 6 months.  Is there an electrical shutoff switch which might account for no fuel at the injectors even when 5 are cracked open.  Have clean fuel at the filter top in the valley, have compression.

Answer
Hello Hoyt,
The injector pump fuel cutoff solenoid is what comes to my mind.
I would probably unhook the glow plug system, and start it on starting fluid, to see if it works loose.
I assume the fuel transfer pump is pumping fuel out of the filter bleeder?

Van