Where is the fuel pump relay switch at on a 1995 Chevy S10 4.3 lit 4x4?

The fuel pump relay location on a 1995 Chevy S10 4.3L 4x4 is in the underhood fuse block, not in the passenger compartment fuse box. It's usually a fairly standard automotive relay. However, there's no single, universally agreed-upon location *within* that fuse block; it can vary slightly depending on the specific trim level and options.

To locate it, you'll need to:

1. Consult your owner's manual: This is the best resource. The manual should have a diagram of the underhood fuse box showing the location of all relays and fuses.

2. Use a wiring diagram: A wiring diagram specific to your year, engine, and trim level will show the location and function of the fuel pump relay. You can find these diagrams online (often via repair manuals sold online or at auto parts stores). Search for "1995 Chevy S10 4.3L wiring diagram".

3. Look for a relay labeled "Fuel Pump" or a similar designation: Once you've opened the underhood fuse box, examine the relays. Many will be labeled.

4. If you can't find a clearly labeled relay: You may need to use a multimeter to test relays to find the fuel pump relay. This requires some electrical knowledge. Be cautious when working with automotive electrical systems.

Important Safety Note: Before working on any automotive electrical system, disconnect the negative battery cable to prevent accidental shorts or shocks.