The Inertia Fuel Shutoff has probably tripped. It is designed to shut the fuel pump off in the event of a collision. Sometimes, though, a bump into a curb, or a hard pothole, will pop it. It works like a circuit breaker in your home. It "pops" and cuts the power to the fuel pump. It is different in the fact that instead of a switch, it has a red button on the top that pops up. It is located in the passenger side kick panel, near the fuse box. Your owner's manual will help you find it. Simply press the button on the top. If it clicks back down, try to restart your truck. If it doesn't, or the truck does not restart, then more diagnosics will have to be performed