Your best bet is to:
1. Consult your owner's manual: This should have a diagram of the underhood fuse and relay box, clearly identifying the fuel pump relay (it might be labeled "fuel pump" or something similar).
2. Locate the underhood fuse/relay box: This is usually located in the engine compartment, often near the battery or firewall.
3. Examine the fuse/relay box: Once you find the box, carefully look at each relay. Many have markings or diagrams printed on the box cover. You might need a flashlight to see clearly.
4. Use a wiring diagram: A wiring diagram specific to your 1994 Camaro 3.4L will show the location and circuit of the fuel pump relay. You can often find these online through automotive repair websites (like AllDataDIY or similar subscription services) or perhaps in a Haynes or Chilton repair manual for your car.
Important Note: Before working with electrical components, disconnect the negative battery terminal to prevent accidental shorts or shocks.