* Under the hood in the fuse/relay box: This is the most common location. The fuse box is usually located either near the battery or on the passenger side fender well. Check the diagram on the inside of the fuse box lid. It should list the relay and its location.
* Inside the cab: Less common, but some models placed some relays inside the cab, often under the dashboard.
To find it definitively:
1. Consult your owner's manual: This is the best place to start. It should have a diagram of the fuse and relay box(es).
2. Check the fuse box diagrams: The diagrams inside the fuse box lid will show the location of each relay and fuse. Look for a relay labeled "fuel pump," "EFI," or something similar.
3. Use a wiring diagram: A wiring diagram specific to your year, engine, and trim level will show exactly where the relay is located and its connections. You can often find these online through automotive parts websites or repair manuals (like a Chilton's or Haynes).
Without knowing your specific Blazer's engine (2.5L, 2.8L, 4.3L) and options, pinpointing the exact location is impossible. Using the above steps is crucial for locating your fuel pump relay.
