That is in the tank, do not go there, that be a dealer thing to do.
You could take a fuel fitting loose to check for fuel flow but that would be getting ahead of the game.
All seems to be fine, state what you did.
I deal with this stuff all the time with students, they did everything and it won't work.
I go over and find the obvious.
You may as well learn to remove the bed, it is your best bet for finding out what is wrong.
Think of it as foreplay, getting into the mood, you will be doing this forever as long as you own this creature.
There are some posts of how to do it but simply having at it will be the best teacher. Takes 10 minutes with a drink, others are faster but nice guys finish last. My wife likes that.
Anyway, after you have removed the bed(hope you do not have a rear bumper on yet) check for spark, have a tester? No? Just hold the boot to engine metal=ground and crank, got spark? Y?N? If N,remember those connectors to check... follow back to the coils and do that open and shut thing to them. If Y pull a plug and see if it is wet and soggy or really black, clean them if so, but before putting them back in blow out the cylinders first with compressed air. This is so you avoid having someone throw water on your fire as you put a match to it. Don't really mean to be a jerk as I go through these machinations, like I said I deal with students and this is how it goes. Fine put back the plugs and give it a rip.
No again? Now take a connector off of a fuel injector and with a test light to ground check for one the wires being 12 positve the light will glow if so. IF not check the fuse box ECM fuse or fuel pump, actually check them all. Then place the test light lead on one wire and the other end on the other wire and crank the motor it may be a glow and off, not real bright, but blinking, noid lights are best otherwise a #194 bulb from you car will work too(dashlight or such,cig ashray bulb).
Don't get to carried away doing stuff or the Dealer may say you caused the problem,keep that in mind.
Sorry if this came off as talking down too, not meant to be, just having a bit of fun along the way.
Good Luck, Hope you get it going.