* Under the hood in the underhood fuse block: This is the most likely location. The fuse block is usually located near the battery. Look for a diagram on the inside of the fuse block cover to identify the fuel pump relay. The diagram should show the relay locations and what each relay controls.
* Inside the cab, usually under the dash: This is less common but possible. If you can't find it under the hood, check under the dashboard on the driver's side. Again, look for a fuse box or relay panel.
To be sure:
1. Consult your owner's manual: This is the best resource for your specific vehicle. It will have a diagram showing the location of all fuses and relays.
2. Look for a relay that is labeled: While not always labeled explicitly as "Fuel Pump Relay," you might see markings that suggest it, like "FP" or related fuel system abbreviations.
3. Use a wiring diagram: A wiring diagram specific to your 1991 Chevy Blazer S10 will definitively show you the fuel pump relay location. You can find these online through various automotive parts websites or repair manuals.
Remember to be careful when working with electrical components. Disconnect the negative battery terminal before working on the fuse box or relay panel.
