Your best bet is to:
1. Consult your owner's manual: If you still have the original owner's manual, it might show the location of the relay panel and have a diagram.
2. Check the fuse box diagrams: The fuse box (usually under the hood or in the dashboard) often has a diagram showing the location of relays. Look for a diagram that labels the relays and find one that is clearly related to fuel or fuel pump.
3. Check common relay locations: Relays are frequently found in the underhood fuse/relay center, and sometimes in a secondary panel inside the car, often near the steering column or under the dashboard.
4. Trace the fuel pump wiring: This is the most time-consuming but surest method. Locate the fuel pump wiring harness (near the fuel tank, usually accessed from the rear of the vehicle). Trace the wire back toward the engine compartment. The fuel pump relay is the switch in the circuit that turns power on and off to the fuel pump. Be cautious working near the fuel system.
5. Use a wiring diagram: A wiring diagram specific to your 1991 Dodge Spirit's year, model, and engine will pinpoint the relay's location. These can sometimes be found online through auto parts websites or repair manuals (like those available through Chilton or Mitchell). Make sure the diagram matches your car's specifications exactly.
Important Safety Note: Working on the fuel system involves potential fire hazards. Disconnect the battery negative terminal before starting any work near the fuel system. If you are not comfortable working with automotive electrical systems, it's best to seek the help of a qualified mechanic.
