My blazer will not start we changed the fuel pump but the pump not getting power the relay fuse is good I'm thinking it is either the ground or wires its self I need help my only car

Check all under dash and under hood fuses with a test light or multimeter. Try removing and cleaning the contacts to the fuel pump fuse and the fuel pump relay with abrasive cloth. Clean all grounds, if the problem persists. After that, check or replace the ignition switch for wear or pitting. If you have an inertia switch, reset it.