* Under the hood, in the fuse/relay center: This is the most likely location. The fuse/relay box is usually located near the battery, often on the passenger side fender. The relay itself will be a small, square component. Your owner's manual should have a diagram of the fuse/relay box identifying the fuel pump relay.
* Under the dash, on the driver's side: Less common, but possible. This would be part of a larger grouping of relays and fuses.
To find it:
1. Consult your owner's manual: This is the best resource. It will have a diagram showing the location and what each relay controls.
2. Look for the fuse/relay box under the hood: This is the most likely place.
3. If it's not under the hood: Check under the dash, on the driver's side. Look for a panel that you can remove to access relays and fuses.
If you can't locate it using these steps, a search online for "1996 S10 Blazer fuel pump relay location diagram" along with your specific engine size (e.g., 4.3L) might yield helpful images. You can also bring it to a mechanic or auto parts store for assistance.