How about the fuel pump relay? or possibly the ASD relay. need to make sure you are getting voltage to the fuel pump when the key is on, the pump will run only for a few seconds when you turn the key to start to prime the system. If you dont hear the pump prime, check the aforementioned relays and associated fuses.
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sounds like a bad fuel pump....get some parts cleaner spray and have a friend spray it into the air horn while you crank the eng if it starts for a second or two while he continues to spray then your fuel pump is bad you need to replace it...or if you dont want to try that bang on the fuel tank under neath the car with a rubber hammer hard while someone trys to start the car ...block your wheels just in case
pour a little gas in to the intake and crank it if it trys to start next thing to check is the fuel pump... this can be done by having another person locate the fuel rail that runs over top of the fuel injectors you will find something that looks like a over sized valve steam for a tire... you can press the little pen in the center if there is pressure you will have gas spray out if not it gas will still come out but at the rate of a trickle while the truck is being turned over... also you can check the pump by listening to the pump in the tank shortly after cranking the engine or just after turning the key to the run position a few times....
Have you sprayed brake cleaner in the intake to see if it will start, if it does then check the fuel pump fuses and the fuel relay, before changing the fuel pump make sure there is power to the fuel pump (test light works fine) always change the fuel filter when putting in a new fuel pump.
i suspect that the crankshaft sensor has gone bad and if this is the case the injectors wll not fire bcus the computer does not see crank rotaton. When you spray a substiute fuel in you are temporarily being the fuel source.
you may need to run a wire from a keyed ignition source that has power while cranking and running to the fuel pump relay and bypass the pcm to test wether it will run, if it runs put a more permanent wire in place.Not too sure what tests youve done but it seems that fuel is what your focusing on so a quick test is too spray engine start up the intake tube to see if the engine trys to run if it does it eliminates a lot of other potential reasons for a no start condition.Also try squeezing the fuel return line to see if the added pressure will try to make engine run.Could be time to replace fuel pump etc anyway let me know how it goes good luck with it