* Under the hood in the fuse box: This is the most common location. The fuse box is usually located near the battery. Look inside the fuse box for a relay labeled "fuel pump" or a diagram that indicates its location. It might be a standard-size relay or a slightly larger one.
* Inside the passenger compartment fuse block (under the dash): This is less common but possible on some 1998 Blazers. Check your owner's manual or a wiring diagram for your specific vehicle to confirm.
To find it definitively:
1. Consult your owner's manual: This is the best place to start. It will have a diagram of the fuse box(es) and identify the fuel pump relay.
2. Use a wiring diagram: A wiring diagram specific to your year, engine, and trim level will pinpoint the relay's location. You can find these online through various automotive parts websites or repair manuals.
3. Look for markings: Once you locate the fuse box(es), carefully examine the relays. Some may be labeled, or the fuse box cover might have a diagram.
Remember to turn off the ignition before working with any relays or fuses. If you're unsure about any electrical work, consult a qualified mechanic.
