1990 G20 won't start

I need a little help from some of you guys with a little more mechanical expertise than myself. I have a 1990 Chevy G20 with a 5.7 that won't start. I can get it to start with starting fluid but if i don't keep the throttle revved up it dies. I removed the breather and all and there is no fuel coming from the injectors. I have checked the fuel filter and it is fine. I also unbolted the fuel lines from the throttle body to see if the fuel is getting that far, and it is. So....... something from the point where the gas enters the throttle body to the injectors isn't working. Is there a sensor causing it? Any ideas???

Go easy on the starting fluid.
Only use cab cleaner as a starting aid.
Check for 12 volts to hot side of injectors.
No power check fuses.
If 12 volt power to injectors check for injector pulse when cranking.
And get a fuel pressure gauge and check fuel pressure for up to par.
9-13 lbs is good.