The fuel pump relay location on a 2004 Chevy S10 pickup truck is
inside the underhood fuse block/relay center. It's not always clearly labeled, so you'll likely need to consult your owner's manual or a wiring diagram. The manual will show you the exact location and the relay's markings.
Many auto parts stores can also provide diagrams or look up the relay's location for your specific vehicle year, engine, and trim level.
