* Fuel Pump Relay: This is usually located in the underhood fuse box (also called the power distribution center or PDC). The fuse box is typically positioned near the battery, often on the driver's side fender. The relay itself will be a smaller, square or rectangular component. Consult your owner's manual or a wiring diagram for the exact location and identification of the fuel pump relay. The diagram should show the relay's location within the fuse box and its markings (it might be labeled "FUEL PUMP" or with a similar designation).
* Fuel Pressure Regulator: On a 1996 Chevy S10 4.3L, the fuel pressure regulator is integrated into the fuel rail. This means it's not a separate component you'll find easily accessible. The fuel rail is located on the top of the engine, near the intake manifold. The regulator is a small part attached to the fuel rail itself; you'll likely need to remove the fuel rail or at least visually inspect the top of the engine to spot it.
Important Note: Always disconnect the negative battery terminal before working on any fuel system components. Fuel is highly flammable, and working with it requires caution. If you're unsure about any aspect of this process, it's strongly recommended to consult a repair manual specific to your vehicle or take it to a qualified mechanic. Improper handling of fuel system components can be dangerous.
