long crankFuel pump has been replaced twice. If it sits over 2 hours it starts right up. Pressure does hold, by the way.

I am working on a 2000 F-150 with 4.2L engine that has a long crank after 1-2 hours of sitting following a drive cycle. Plugs are new, fuel pressure is within spec. It starts fine cold, sitting less than 1 hour or more than 2 hours. I am in Southern California. Any experience with this...