Fuel Pump
Fuel Filter
Pressure Regulator
Fuel Injectors
Air Flow Sensor
Engine Coolant Temperature Sensor
Oxygen Sensor
Throttle Body
Engine Control Module

When you want to go

If you take a minute to watch the youtube.com video - linked here - you'll gain a whole new appreciation for the Round Rock Muffler and Automotive professional mechanics.   

Youtube Video on how fuel systems work