1988 chevy will not run,fuel injecter will not spray fuel tried fuel pump all sensors and computer will run if you poor fuel in the throttle body.

Check Fuel Filter

year/make/model/engine size??? Do a fuel pressure test to see what the pressure is. Low/no pressure= poor spray

The computer controls the injection of the fuel. If you look at the wiring diagram you will note the bottom 4 pins that are the negative and positive to the left and right injection. Atleast on my 1991 it is .Could be the ecm or computer is sending a false signal or not sending one at all. A sign of this is the fuel pump in the gas tank can be heard and will continue to run as if pressure in the fuel system is not building. Tthe truck want crank as if no fuel. When starter fluid is injected into the Throttle body the egine will start and run untill fluid is used up. It will keep running as long as fluid is added.

did you check for vacuum leaks dodge is known for the plantuim gasket to go if not familiar this is the gasket under the intake manifold

Did you check the fuel pressure before you replaced the pump ?
Can you spray carb cleaner or starting fluid into the throttle body and make the engine want to start ?
If it is throttle body injected, can you see the fuel spray when you crank it hot ?

Check all fuel lines for leaks, make sure it doesn't have bad gas in it. Listen for fuel pump when key is turned on. Change fuel filter. See if that's helps.

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fuel pressure regulator bad,full bypass when vacum applied.

EATHER IS NOT GOOD , ITS FOR COLD COLD MOTORS.. CHECK YOUR FUEL PRESSURE AND GAS FILTER .YOU MIGHT HAVE A BAD FUEL PUMP ITS IN THE GAS TANK!!! . USE CARB & CHOKE CLEANER ..PARTS MASTER # 1736 ..ITS NOT AS HOT AND WONT POP A HEAD GASKET .IF'N I WAS ANY HELP AT ALL PLEASE VOTE.. JAY

8 - 9 psi is too low for throttle body injection, locate and replace the fuel pressure regulator.

Does it run poor at full throttle or between quarter and half throttle? Does it hessitate? If it does the EGR valve may be worn out. I had an 87 transam with TPI and was having problems with it stumbling and hesitating when it was warmed up. If the car starts hard and you have these problems then the issue may be low fuel pressure. Hook a guage up to the fuel rail and make sure you are getting pressure. If you are only getting a few pounds of pressure it may be the fuel pump or fuel pressure regulator. Good luck and if you thought this information was helpful please rate it when you get a chance.

Thanks - Tech101