Where are the fuel injectors located?

If you have a MPFI (multi port fuel injection) the injectors are either on the intake manifold or the cylinder head in either case they are usually close to where the intake manifold and cylinder head meet.There will be a fuel line feeding all injectors and a electrical plug to each one.Since I don't know what vehicle you are referring to,it is possible it has throttle body fuel injection,looks a little like a carburetor and will be on the intake manifold.