* Under the hood in the fuse box: This is the most common location. The fuse box is usually located near the battery. Look for a diagram on the inside of the fuse box lid to identify the fuel pump relay. The relay itself might be labeled, or you might have to consult a repair manual or online diagram to identify it based on its amperage or function.
* Under the dashboard: Less common, but possible. This is usually within the main fuse panel, often behind a panel near the steering column.
To find it definitively:
1. Consult your owner's manual: This is the best resource, as it will have a diagram showing the location of all relays and fuses.
2. Use a wiring diagram: A wiring diagram specific to your 1995 GMC Sonoma (including engine size - 2.2L, 4.3L, etc.) will clearly show the location and circuit for the fuel pump relay. You can find these online through repair manual websites or forums dedicated to GMC Sonomas.
3. Look for markings: Once you've located the fuse box(es), carefully examine the relays. Some might be labeled "Fuel Pump" or have a similar indication.
Important Note: Before working on electrical components, always disconnect the negative battery terminal to prevent accidental short circuits.
