Have you checked the fuel, my 85 nissan pu fuel pump actually ran
without any power for  long time on pressure alone it was sputtering
sometimes though and one day it wouldn't start. Loss power between
battery and fuel control unit under the glove box. Turn ignition key to
on and see if fuel pump is running.

You can also check the solenoid, but I would do the simple checks 1st
like spark and fuel before you spend any time or money on replacing
stuff

"Thanks for your input.  I found the fuel cutoff solenoid on the carb
(just like you said) this past weekend.  But by that time I had
essentially solved the problem in a roundabout way.  I connected a wire
directly to the "coil" fuse in the fuse panel.  Then I attached an in-
line 10A fuse.  From there I routed the wire through the dash to a
small rubber cutout I found in the passenger side floor under the
carpet.  From there I routed the wire along the frame to the fuel pump,
where I soldered this wire directly to the fuel pump and used shrink
wrap and plenty of electrical tape to protect the wires from the
elements.  Then I removed the "fuel pump" fuse, disabling the entire
factory installed circuit.

So, in my truck the fuel cutoff solenoid is a non-issue, as is the
factory wiring problem. "