* Underhood Fuse Box: This is the primary location. The fuse box is usually located under the hood, often near the battery. Your owner's manual will have a diagram showing the fuse and relay positions. Look for fuses labeled "Fuel Pump" or related circuits (e.g., injection system, EFI). The fuel pump relay might also be in this box; look for a relay that's clearly marked or that corresponds to a circuit description related to fuel delivery.
* Relay Center (Possible): Some 1989 Caprices might have a separate relay center, often near the fuse box or elsewhere in the engine compartment. Check your owner's manual for this possibility.
Without the owner's manual, finding the specific components will require some detective work:
1. Visual Inspection: Carefully examine the underhood fuse box. Look for labels on the fuses and relays. The fuse might be labeled something like "Fuel Pump," "EFI," or "Injection." Relays are usually square or rectangular components with several terminals.
2. Wiring Diagram: If you can find a wiring diagram for your specific 1989 Caprice Classic (online or from a repair manual), it will definitively show you the location of the fuel pump relay and relevant fuses.
3. Test the components: A multimeter can help. If you're comfortable with basic electrical testing, you can test the fuses with the multimeter to see if they're blown. Testing the relay is more advanced and involves checking continuity and voltage at specific terminals when the system is activated (the ignition switch is on). This is something best done with detailed knowledge of your car's electrical system or professional assistance.
Caution: Working with the electrical system of your car can be dangerous. If you're unsure about any step, it's best to consult a qualified mechanic. Incorrectly working with the fuel system could also lead to fire hazards, so be extremely careful.
