Truck will turn over but won't start

When you are trying to start the truck, does the theft light on the dash flash rapidly ?
- This would be a problem with the key used, PATS is not recognizing it as a programmed key, try another key
- Could be a problem with the PATS transceiver if 2nd programmed key does the same thing, wait on confirm to get into this, kind of long.

Have you checked the Fuel Inertia switch in the passenger side kick panel ( button reached from the top, needs to be pressed down ) ?

When you turn the key from off to run ( do not start ) do you hear the fuse pump run for ~ 2 seconds ? Should be able to verify at the schrader valve at the fuse rail for pressure ( safety glasses and a rag )
- Fuel pump fuse is one to check, Engine compartment fuse panel, fuse # 10 & Fuse # 18
- Fuel pump relay could be a problem, can swap with a trailer tow relay from the battery charge function ( if the trailer tow package is installed ).
- If both of these are no change, turn the truck to the run position ( do not start ) and hit the bottom of the fuel tank with a rubber mallet. Could be the fuel pump is plugged or on its way out.

Other item to check, is the last time the fuel filter way changed.