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lets start by verifying the fuel system
All fuel systems are equipped with a fuel tank module mounted, fuel pressure regulator. The fuel pressure regulator is not controlled by engine vacuum.
With engine at idle speed, system fuel pressure should be 49.0 psi ± 2 psi
WARNING: DO NOT ALLOW FUEL TO SPILL ONTO THE ENGINE INTAKE OR EXHAUST MANIFOLDS. PLACE SHOP TOWELS UNDER AND AROUND THE PRESSURE PORT TO ABSORB FUEL.
WARNING: WEAR PROPER EYE PROTECTION WHEN TESTING FUEL SYSTEM PRESSURE.
Before performing this test, verify fuel pump pressure by performing the previous tests.
Abnormally long periods of cranking to restart a hot engine that has been shut down for a short period of time may be caused by:
Let me know how you make out with this and we can move on to more testing if needed