HELP! HELP!! I still can't get this truck to start....

I hate to resort to replacing parts without testing them to now they are defective. It becomes inefficient and expensive. You have replaced so many of the fuel system components but it requires the computer to see power at the computer, and inputs from the ignition switch and the computer needs to see that the engine is cranking or running to power or trigger the fuel injectors. You need a wiring diagram and a Volt/Ohm/Ampmeter to do testing at the computer to see that the computer is seeing power ,ground, inputs, processes this information, makes decisions and controls out puts.

my truck is a bit newer,but same problems,replaced lots of sensors,pump,etc..try oil/fuel pressure sensor/switch..crankshaft position sensor