Is your fuel system primed? Seems like my favorite question lol. But It s a good place to start.
If your fuel tank goes empty and you have to put gas in the tank you will have to prime the fuel system. It will take a little while for the fuel to get pumped through the entire fuel system (primed). So you cant just put some gas in and expect it to start right away. To prime the system you have to put enough gas in the tank to pump it through the system (1-2 gallons. trust me on that!) and then turn on the the ignition (key on but not starting) and listen for the HP fuel pump to turn on for a few seconds and then it will turn off on its own, then turn off the ignition and wait a couple seconds, try to listen for a relay under the hood to click off (2-3 seconds after the key is turned off), and then repeat the process(cycle) over and over tell the system is primed (try starting it every few cycles).
easiest way to check the inline pump is at the schrader valve, just prime then check the valve. you should get a good squirt. If not, move on to the pumps, and back here to let us know.
The inertia switch you just push it in and let go, Inside the switch is a metal ball that sits in a magnetized bowl. when you push the button it forces the ball back in the bowl. When the ball is in the bowl(normal) the ball seated in the bowl complete an electrical circuit that allows a signal to get sent to the EEC allowing the truck to start and run. If the truck is hit hard enough while running it will pop the metal ball out of the bowl breaking the circuit and no signal gets to the EEC witch will shut off all the fuel pumps, and you cant start it tell you press the button.
FYI: I'm not telling you or anyone to do this! but just in case of an emergency or the switch some how goes bad(but not likely) the switch is easily bypassed by unplugging the two pink n green wires that plug in to the bottom of the switch and connecting them together. This way the switch is taken out of the loop and a constant signal gets to the EEC allowing you to start and drive the truck.