To find it, you'll need to:
1. Consult your owner's manual: This is the best place to start. The manual should have a diagram showing the location of all relays and fuses.
2. Check the fuse box under the hood: This is the most common location for relays. The fuse box usually has a diagram on the inside of the cover identifying the different components. Look for a relay labeled "Fuel Pump," "EFI," or something similar. Many times, the fuel pump relay is grouped with other engine-related relays.
3. Check the fuse box inside the car (if applicable): Some Firebirds might have a secondary fuse box inside the passenger compartment.
4. Look for a wiring diagram: A wiring diagram specific to your 1991 Firebird's year, engine, and options will precisely show the fuel pump relay location. You can often find these online through forums dedicated to Firebirds or through repair manuals.
Without the specific details of your Firebird's engine (V6 or V8) and fuel system, I cannot give you a more precise location. Be sure to double-check any relay you find against your owner's manual or a wiring diagram to be absolutely sure it is indeed the fuel pump relay.
