1992 Chevy Cheyenne tbi unit

Wount start on own but if gas is dumped in it it will start and stay running as long as you pump the gas.

If the injector driver circuit in the computer is defective you can pump the gas all day and it will not start or run at all.

Do you hear the fuel pump for 2 secs when key at run position? If so check the fuel pressure and comeback with the readings this is where we start-

What opens and closes the injectors-it relies on an ignition reference signal-the computer has to know if the engine is turning over/cranking whatever the case may be at which time the quad drivers will switch the circuit on and off to the injectors to give fuel