Where is the relay cutoff switch located on a Chevy Blazer 2001? on 2001 Chevrolet Blazer

My vehicle does not start,I put a new fuel pump in;and relay switch,crank shaft sensor and a fuel pressure sensor,so I am @ a stuck,to determine that it could possibly be the fuel cutoff sensor,and that is why I want to know where it is located on the vehicle.

Asked by for the 2001 Chevrolet Blazer