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There are a few things you can check, have someone turn the key on and listen to see if you can hear the fuel pump turn on, which is located in the gas tank. If you can not hear the fuel pump turn on try hitting the bottom of the gas tank with your fist or a rubber mallet in the center of the tank while someone tries to start the truck.
Try spraying starting fluid in to the throttle body and see if it starts. If ot starts than the pump may not be pumping.
If you do hear it running you check to see if it is getting spark by removing a spark plug wire from a spark plug laying the tip of the plug wire next to a metal object on the engine
and have someone crank the engine to see if you get any spark.
If it starts after you smack the tank then you will need a fuel pump and I would also change the fuel filter.
The throttle is what the air intake hose connects to on the engine, here is a picture:
Have someone push on the gas pedal then spray into the throttle body, reinstall the hose and try to start the truck.