Why doesn't it start?

Sounds like a fuel pump issue.

When you push start button, do you hear a rapid series of clicks, or a single click?

Try changing the fuel filter. Chances are when it ran out of gas it sucked all the old gunk and stuff into the lines. If that doesn"t work you may have to take it to a professional to have the gunk sucked out. Also after you change the filter dump some fuel injector cleaner into the tank that should clean up any remaining residue.

Could be a number of things but may want to begin by checking wiring to starter, battery, or even the ignition switch. These components may not turn your engine light on.

Most Fords have a fuel reset button. When you ran out of gas you tripped the circuit. Most of the time the button will be on the passenger side by the kick panel. The exact location should be in your owners manual or your local library or auto parts store will have a copy of one for your specific vehicle.

Check ur engine

Motor start capacitor probably bad.

Won't crank or won't start.

your fuel filter maybe plug try this website to see if they have your truck listed its www.autozone.com if they do you be able to check on a price and get pictures and diagram too and here is another one www.alldatadiy.com for repair information too.