03 suburban cranks but wont start has new fuel pump

How long since a tune-up? Any applicable trouble codes? Make sure battery has a full charge and battery cables/connections all good? Have a helper crank it while you visually check for spark at the plugs? If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse, engine cranking. If your missing everything, I usually check for rpm signal, comes from crank sensor. Don't replace anything unless your testing points in that direction. You can check voltage and ground to fuel pump, if you think that is the only issue? At the pump, gray wire is usually voltage, black wire is ground, check them both.