Most modern vehicles use some form of fuel injection, as opposed to earlier cars that employed a carburetor to mix gasoline and air on it's way into the engine. Normally most car owners never see more than the exterior of the fuel injectors under the hood. Here's your chance to catch a glimpse of what's going on inside each of those fuel injectors that sit atop the engine. About This Video The above video the operation of the automotive fuel injector. It goes into how to test the fuel injector, theory of operation and other aspects of reading the injector waveform on the automotive scope. Finally, coverage is also given as to the specific current flow characteristics for automotive fuel injectors. Schools may use this automotive technology video as an in-class companion.