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Originally Posted by BlazerLT
Take a voltmeter out and test the voltage when the engine is not running.
Also check fuel pressure. Should be 61-66psi with the key to on, but the engine not started.
Try allowing the pump to prime before starting by turning to the position before start for 2 seconds, you will hear the pump prime. Then start it.
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As BlazerLT said check that fuel pressure.
Here is some guide lines.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.