* Under the hood in the fuse box: This is the most common location. The fuse box is typically located near the battery. Look inside the fuse box for a relay labeled "fuel pump" or a diagram indicating its position. Sometimes it's not labeled explicitly, and you may have to trace wiring or consult a wiring diagram specific to your Cavalier's engine and options.
* Under the dash: Less common, but some models might have the relay inside the under-dash fuse panel/box.
To find it with certainty:
1. Consult your owner's manual: This is the best resource. It should have a diagram showing the location of all relays and fuses.
2. Use a wiring diagram: A wiring diagram specific to your 1985 Chevy Cavalier's engine (e.g., 1.8L, 2.0L, etc.) will show the fuel pump relay's location and circuit path. You can find these online through repair manuals (like Chilton's or Haynes) or specialized automotive websites.
3. Use a multimeter: If you're comfortable working with electricity, you can trace the fuel pump wire back to the relay. This requires some electrical knowledge and safety precautions.
Important Note: Before working on any automotive electrical system, disconnect the negative battery terminal to prevent accidental shorts.
