2002 GMC Sonoma fule pump

A no load test on a fuel pump isn't worth much. I've seen faulty pumps that would run laying on the bench, but, when you put a load on it, you get nothing.

If you tested the gray wire at the fuel pump connector, engine cranking, and no voltage, your correct, check the relay in the power distribution center, under the hood. Ecm B fuse supplies voltage to load side of relay. The control/coil side of relay also gets voltage from the pcm. Not sure of actual voltage supplied to that circuit, use digital multimeter if testing.