To find it:
1. Locate the underhood fuse box: This is usually a large plastic box near the battery, often under the hood on the driver's side.
2. Open the fuse box: There should be a cover with a diagram showing the fuses and relays. The diagram will likely use symbols or list the components.
3. Look for the fuel pump relay: The diagram may explicitly label it "Fuel Pump Relay" or use a symbol related to a fuel pump. It might also be labeled with a number. Commonly, it's a standard automotive relay. They're usually square or rectangular.
4. Check the relay's markings: Even if the diagram isn't clear, you might find "Fuel Pump" or a similar abbreviation printed on the relay itself.
5. If you can't find it using the diagram: Your best bet is to consult your owner's manual. It will have a detailed fuse and relay diagram specific to your truck.
If you still can't locate it, a mechanic or an online forum dedicated to S10 trucks could provide further assistance. Be sure to specify the engine size (4.3L V6 or 2.2L 4-cylinder) as this *could* influence the location, although less likely.