* In-tank: Many 1991 Silverados had the fuel filter integrated into the fuel pump assembly *inside* the fuel tank. This is the most common location. You'd need to drop the fuel tank to access it.
* Frame rail: Some models, especially those with certain engine options, may have had a separate fuel filter mounted on the frame rail, often near the fuel tank. This would be easier to access than an in-tank filter.
To determine the exact location:
1. Check your owner's manual: This is the best resource. It should have a diagram showing the fuel filter location.
2. Look under the truck: Carefully inspect the frame rails near the fuel tank. The filter (if not in-tank) is usually a cylindrical canister with fuel lines attached.
3. Consult a repair manual: A Haynes or Chilton repair manual for your specific year, make, and model Silverado will have detailed diagrams and instructions.
4. Search online: Use your truck's VIN number in your search to ensure you're finding information specific to your exact model.
Remember to disconnect the battery's negative terminal before working near the fuel system. Fuel is flammable, and there's a risk of fire or explosion. Always exercise caution when working on your vehicle's fuel system.
