1. Consult your owner's manual: This is the best place to start. The manual should have a diagram of the fuse and relay box.
2. Check the fuse block diagram: Often a diagram is on the fuse block cover itself or printed inside the cover. This will show you the location of the relay.
3. Use a multimeter: If you can't find it visually, use a multimeter to test the relays in the underhood fuse box. You can identify the fuel pump relay by checking for continuity across its terminals when the ignition is turned on. Caution: This requires basic electrical knowledge and safety precautions.
4. Look for a relay with a distinct marking: Sometimes, the relays aren't clearly labeled, but the fuel pump relay might have a slightly different shape or marking compared to others.
Without the owner's manual or a diagram specific to the 1982 Camaro Z28 Crossfire, pinpointing the exact location is difficult. The fuse box location itself is usually in the engine bay, often near the battery.