1988 S-10 Blazer not getting fuel to the throttle body injectors

1988 S-10 Blazer mileage: 127,000. I am not getting fuel to the throttle body injectors. I have replaced the fuel relay located in the engine compartment. I replaced the computer unit. I used the noid test light on each injector connector. I am getting no power to the connector. I can prime the throttle body, and the engine starts and runs perfect. After the car has run for about 20 minutes, if it is shut off, it has to be primed before it will start again.