To find it, you'll need to do some detective work:
1. Consult your owner's manual: This is your best first step. While it might not explicitly state "fuel pump relay," it might show a diagram of the fuse box and relay panel locations.
2. Check the underhood fuse box: This is the most likely place. Many Ford vehicles place relays in the main fuse box under the hood. Look for a box or panel labeled "relays" or containing numerous small square components. Carefully examine each relay for markings. Some might be labeled, while others require checking a wiring diagram or using a multimeter to test continuity to the fuel pump circuit.
3. Look in the interior fuse box (passenger compartment): Though less common, some relays are located inside the car's cabin. Check the fuse box(es) located typically under the dash.
4. Use a wiring diagram: A wiring diagram specific to your 1991 Ford Probe GL will show you the relay's location and circuit. You can often find these online through repair manual websites (some are free, some are paid) or at auto parts stores.
5. Use a multimeter: This is the most reliable method. With a wiring diagram in hand (showing the fuel pump circuit), use your multimeter to trace the circuit from the fuel pump's wiring harness back to find the relay that completes the circuit. This requires some electrical knowledge.
Important Note: Before working on electrical components, always disconnect the negative battery terminal to prevent shorts and potential injury.
