Hello and welcome to Just Answer!
The first thing I would do is try to start the engine on starting fluid to see if it stays running after. Remove the large intake hose from the drivers side of the intake and spray a little starting fluid in as someone cranks it over. Don't use starting fluid at the air filter box, you need to remove the hose from the intake. The large clamp nut is 7/16".
Let me know if it stays running and we can go from there!
Are you getting any fault codes? Check both the PCM and ECM for codes.
Can you remove the plastic cap from the schraeder valve on the side of the injection pump and have someone bump the key to the start position while you press the little valve core in. The transfer pump should run for 25 seconds and you should get a good flow of fuel out of the fitting with the valve pressed in. You might want to hold a rag there to catch the fuel.
Let me know and we can go from there!
Can you try to push the valve in with a small screw driver to make sure it has good flow coming out?
Lets try this - Sit in the vehicle with all doors closed and starting with the key in the off position(1 click clockwise from being able to pull your key out) turn it to ON, OFF, ON, OFF, ON(don't turn the key to the start position just on) within 5 seconds and leave the key on and watch the digital odometer to see if it displays a fault code. It will be a P followed by 4 numbers example P1693. When it is done displaying codes or if there are no codes it will say done. If you can't get this to work, please try it again following the instructions!
I think you should add some fuel to the tank, even though the tank shows 1/8, you could be out of fuel! We did see some problems with fuel level sending units back then and people would run out of fuel even though the gauge showed 1/8 - 1/4 tank.
After you add fuel you will need to bleed the fuel out again and see if it still has air in it. You might have to do this a couple times.
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Loosen # XXXXX 3 & 4 injector line nuts(3/4") at the head and crank the engine over until fuel is spraying out and all the air is out. You might have to do this a few times! Don't crank the engine over for more than 15 seconds at a time, let the starter cool after each time.
Then once you have fuel coming out, tighten the lines and try to start your truck. It will knock and run rough, but will straighten out!