With key on engine off listen to your fuel pump see if it will prime(you are looking for buzzing sound from fuel pump for few seconds),if it does not do that you need fuel pump,if it does then you need borrow fuel pressure gauge from local auto part store and check the fuel pressure,put the key in ignition on key on,engine off you should get between 37 to 41 PSI
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With key on engine off listen to your fuel pump see if it will prime(you are looking for buzzing sound from fuel pump for few seconds),if it does not do that you need fuel pump,if it does then you need borrow fuel pressure gauge from local auto part store and check the fuel pressure,put the key in ignition on key on,engine off you should get between 37 to 41 PSI