2000 Chevy Blazer Fuel Pressure Problem

Greetings. Chevy Blazer has difficulty starting may take upto 3 sets of 5-10 second cranks before it starts. Once started runs smooth with the exception of the inital start. Engine has maybe 30-40 seconds of really slow nearly no pick-up then seems like pressure kicks in and the truck runs great at all speeds until you turn it off and let it cool for a while. It's not loose gas cap, fuel filter, throttle position sensor (all changed/adjusted). Approximately 1.5 years ago the fuel pump was replaced and that seemed to fix the problem back then, but now its resurfacing again. Local mechanics seem dumbfounded as the issue is not presenting any codes except for occaisonal low pressure code. I think I need a new fuel pump again but I'm no expert. What say you?