You'll need to consult your owner's manual to find the correct fuse and relay. The owner's manual will show a diagram of the fuse box(es) and list what each fuse and relay controls.
Here's what you should do:
1. Locate your owner's manual: This is the most reliable source of information.
2. Look for the fuse box diagrams: These diagrams will usually show the fuse and relay locations within the fuse boxes (there might be more than one). The labels might refer to the circuit as "Fuel Pump" or something similar, but more likely will refer to a related circuit like an "Engine Control System" fuse or a relay.
3. Check the fuse(s) related to the fuel pump circuit: Make sure the fuse(s) is/are not blown.
4. Check the fuel pump relay: Even if the fuse is good, the relay might have failed.
Without your owner's manual, it's impossible to give you the precise location. Searching online for a "2002 Chevy Avalanche fuse box diagram" might give you a picture, but always verify the information with your owner's manual. Using an incorrect fuse could damage your electrical system.
