If the Fuel Pump Relay Is Good Ten What Is Keeping the 2003 GMC SONOMA; If the fuel pump relay is good ten what is keeping the fuel pump from working I know the fuel pump is good since I have bench tested it Do you. have the same problem? What Do I Do If My Fuel Pump Relay Wont Engage But The Relay And Fuel Pump Are Still Good. 2003 GMC Sonoma Relay - Fuel Pump - autozone Equip cars, trucks & SUVs with 2003 GMC Sonoma Relay - Fuel Pump from AutoZone. Get Yours Today! We have the best products at the right price.