Fuel pump. On the passenger side of the intake manifold, on a silver tube(fuel rail) there is a fitting that looks like a valve stem on a tire. Remove the cap and with a small screwdriver carefully press the valve inside. Gas should spray out with some force. If it does not, or just kind of dribbles, chances are your fuel pump is bad. Fuel pumps on these trucks are in the tank, therefore the tank will have to be dropped to change it.
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