Here are the more likely scenarios and how to troubleshoot them:
* Inertia Switch: This is a safety device that cuts fuel in a collision. It's usually located under the dash or in the engine compartment. Look for a small, usually red, button or lever. If it's popped out, push it back in. This is the closest thing to a "fuel shut-off switch" that many Rangers have.
* Fuel Pump Relay: A faulty fuel pump relay can prevent the pump from turning on, starving the engine of fuel. You'll need to locate the relay (usually in a fuse box under the hood or inside the passenger compartment) and try swapping it with another relay of the same amperage (carefully checking the relay's diagram). If the truck starts with the swapped relay, you've likely found the culprit.
* Fuel Pump: The fuel pump itself could be failing. This is a more involved fix and usually requires a mechanic.
* Bad Crankshaft Position Sensor (CKP) or other Sensors: These sensors tell the computer critical engine information. A faulty one can prevent the engine from starting, even if fuel is available. A diagnostic scan tool is helpful here.
* Low Fuel: Sometimes the simplest explanation is the best one. Make sure you have enough fuel in the tank.
* Security System: If your Ranger has a factory or aftermarket security system, a problem with it could be preventing the engine from starting.
What to Do:
1. Check the inertia switch first. This is the easiest and quickest check.
2. Check the fuel level.
3. If the inertia switch is okay and you have fuel, check the fuses and relays. Consult your owner's manual for the location of the fuse and relay boxes.
4. If none of the above works, you'll likely need a mechanic or a diagnostic scan tool. A scan tool can read trouble codes from the vehicle's computer, pointing to the specific problem.
Important Note: Don't attempt any advanced repairs unless you're experienced with auto mechanics. Incorrectly working with fuel systems can be dangerous. If you're not comfortable troubleshooting these issues yourself, take your truck to a qualified mechanic.
