The function of a Fuel Injector in your Car is to spray atomized fuel into the combustion chamber of an internal combustion engine.

A mechanical or electrical pump for drawing fuel from a storage tank and forcing it to an engine or furnace.

Fuel is your engine's food. This substance needs to be fed to the engine regularly so that it functions properly. Now, to ensure that the engine gets its daily dose of fuel, it relies on the fuel pump.