To locate it precisely:
1. Open the hood: Locate the underhood fuse box. It's usually a black plastic box, often near the battery or firewall.
2. Consult your owner's manual: Your owner's manual should have a diagram showing the fuse and relay locations within the box. This is the best and most accurate way to find it.
3. Look for markings: Even without the manual, many fuse boxes have markings indicating which relay is for the fuel pump. Look for labels like "Fuel Pump," "FP," or a similar designation. The relay itself will likely be a small square or rectangular component.
If you can't find it in the underhood fuse box: It's less common, but some vehicles might have the fuel pump relay located in a separate relay center or even within the cab. Again, your owner's manual is crucial.
If you don't have the owner's manual: You can often find a digital version online by searching for "[year] GMC Vandura 2500 owner's manual" on Google or a similar search engine. You might also find diagrams specific to fuse box locations on automotive forums dedicated to GMC vehicles.
Remember to always disconnect the negative terminal of your battery before working with any electrical components to prevent accidental short circuits.
