* EFI: You'll see a fuel rail on the intake manifold with fuel injectors spraying fuel directly into the intake ports. There will be no carburetor. You'll likely see various sensors and wiring harnesses connected to the fuel system components.
* Carburetor: You'll see a large, usually metallic, device mounted on top of the intake manifold. This is the carburetor. It's a relatively simple-looking device compared to the complexity of an EFI system.
If you're unsure after looking, you can also:
* Check the owner's manual: If you still have it, the manual should specify the fuel system type.
* Check the vehicle identification number (VIN): While the VIN itself won't directly say "EFI" or "Carb," you can use a decoder (many are available online) to get the full specifications of your vehicle, including the engine type. Knowing the engine type often indicates whether it used EFI or a carburetor. For example, certain engine codes were exclusively available with EFI.
* Consult a GMC parts website: Enter your VIN on a reputable GMC parts site. The parts diagrams associated with your engine should clearly show the fuel system.
Keep in mind that it's highly unlikely a 1992 GMC 2500 Vandura would have a carburetor. GMC largely transitioned to EFI by that year. But visually checking under the hood is the most reliable method.
