Where is 2001 blazer fuel injector location?

The fuel injectors on a 1991-2001 Chevrolet Blazer are located on the intake manifold, directly above the intake valves of each cylinder. They're usually fairly easy to see once you remove the upper intake plenum. However, the exact location will vary slightly depending on the engine (4.3L V6, 5.7L V8, etc.). You'll need to consult a repair manual specific to your Blazer's year and engine to get a precise visual.