Do you still use an injector prime shot for startup or have you tuned around that with cranking fuel?
If you don't currently use it, try adding in some prime shot and see if that will get the engine to fire and continue running. If you have a second set of hands, I'd have somebody look to see if the injectors are firing at all during crank or after the engine fires. I'm leaning towards there being a fuel pressure issue. The pump can be pumping but if the fuel pressure regulator has gone bad, you'd have very little or no fuel pressure to fire the injectors.
The system seems to be doing what it's supposed to, but there's no fuel going through the engine.
If it turns out to be the FPR, you want a genuine Boshce in there. Part number 0280160575
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-Jason
1969 Pontiac Firebird
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