To find it definitively:
1. Consult your owner's manual: This is the best place to start. The manual should have a diagram showing the location.
2. Look near the fuel tank: This is the most common area for the fuel filter on these trucks. Follow the fuel lines from the tank; you should find the filter somewhere along that route. It's often held in place by clamps or straps.
3. Check online forums: Search for "1989 Chevy Silverado 2500 fuel filter location" on forums dedicated to classic Chevy trucks. Users often post pictures and descriptions of their experiences.
4. Look under the truck: You'll need to be under the vehicle to see it clearly. Use jack stands for safety. Be careful around hot exhaust components.
Remember to take safety precautions when working under your vehicle. Wear safety glasses and gloves. Properly support the vehicle with jack stands.