[Image of 1991 GMC Sierra fuel pump wiring diagram]
Here are the steps to locate the fuel pump wiring diagram for a 1991 GMC Sierra:
1. Obtain the vehicle's repair manual or search for the wiring diagram online.
2. Refer to the section covering the fuel system or electrical system.
3. Locate the specific page that includes the fuel pump wiring diagram.
4. The diagram should provide details about the wiring connections, wire colors, and other relevant information necessary for understanding the fuel pump electrical system.