* Faulty Fuel Pump Relay: This relay acts as a switch, turning the fuel pump on and off. A bad relay will prevent the pump from receiving power.
* Wiring Issues: This is a common culprit. Look for:
* Broken or corroded wires: Check the wiring harness leading to and from the fuel pump, as well as the connections at the relay and the fuel pump itself. Pay close attention to areas prone to chafing or movement.
* Short circuits: A short in the wiring can prevent the pump from operating correctly or even blow a fuse.
* Poor connections: Loose or corroded connections can interrupt the electrical flow. Clean and tighten all connections.
* Inertia Switch: Some Ford Rangers have an inertia switch (a safety device that cuts power to the fuel pump in a collision). If this switch has tripped, it needs to be reset (usually a small button on the switch itself). This is usually located under the dash or in the engine compartment.
* Fuel Pump Control Module (PCM) issues: While less common, a problem with the PCM's control over the fuel pump's secondary circuit could also be the cause. This requires more advanced diagnostics and possibly professional help.
* Bad Fuel Pump Driver Module: This component, sometimes integrated into the PCM, controls the power to the fuel pump.
* Fuse: Check the fuse that protects the fuel pump circuit. A blown fuse indicates a short circuit somewhere in the system.
Troubleshooting Steps:
1. Check the fuses: Locate the fuse for the fuel pump in the fuse box (usually under the hood or inside the cabin) and check if it's blown. Replace if necessary.
2. Inspect the wiring: Visually inspect the wiring harness leading to the fuel pump for any damage, corrosion, or loose connections.
3. Test the fuel pump relay: You can swap it with a known good relay (of the same amperage) to see if that solves the problem. You can also test the relay directly with a multimeter.
4. Locate and check the inertia switch: Reset it if it's tripped.
5. Check fuel pump power: Use a multimeter to check for power at the fuel pump connector when the ignition is turned on. If there's no power, the problem lies upstream (wiring, relay, etc.). If there's power, the fuel pump itself may be faulty.
If you're not comfortable working with automotive electrical systems, it's best to take your Ranger to a qualified mechanic for diagnosis and repair. Attempting repairs without proper knowledge can lead to further damage.
