What does a Fuel Injector do?

What does a Fuel Injector do? Welcome to Mercie J, where compassion and craftsmanship come together, I'm Rick Smith.
Now an engine, in order to function, we compress a mixture of air and fuel. Sometimes we compress only air and then we put the fuel in. We compress this volume of air and this air/fuel mixture, then a spark plug on a gasoline engine ignites it. That's what gives us the power going down the road.