Before You Begin:
* Safety First: Diesel fuel is flammable. Avoid sparks and open flames. Ensure the engine is completely off.
* Locate Your Fuel System Components: Familiarize yourself with your truck's fuel filter, lift pump (if equipped), and fuel lines. Your owner's manual is your best resource here.
Methods:
1. Lift Pump (Manual or Electric): Many diesel systems have a lift pump to assist in drawing fuel from the tank to the engine.
* Manual Lift Pump: If your truck has a manual lift pump (a small lever or knob usually near the fuel filter), repeatedly pump it until you see firm resistance and fuel appears clean and free of air bubbles in the clear fuel filter housing (if equipped). This is often the most effective method.
* Electric Lift Pump: If you have an electric lift pump (often incorporated into the fuel filter assembly or near the tank), you might need to turn the ignition to the "on" position (without cranking the engine) to activate it for a few seconds, repeatedly, to fill the lines. Some systems require you to cycle this several times. Listen for the pump's hum.
2. Bleeding the System: Some systems may require bleeding individual fuel lines or the filter housing. Look for bleeder screws or valves. Loosen these slightly while someone pumps the lift pump (if applicable) to allow air to escape. Tighten when fuel flows steadily.
3. Fuel Filter: The fuel filter is a common point for air to accumulate. If your system has a clear filter bowl, you can observe the process visually. A clear bowl will show if you have air or fuel in the system.
4. Cranking the Engine: After priming the system, try cranking the engine for short intervals (10-15 seconds) with pauses in between. This allows the injectors to draw fuel. Prolonged cranking without fuel can damage the starter.
5. Check for Leaks: After getting the engine running, inspect fuel lines and connections for any leaks.
If the Engine Still Won't Start:
* Low Battery: Repeated cranking can drain your battery. Jump-starting may be necessary.
* Fuel Contamination: There's a chance the fuel in the tank is contaminated or contains water (very common after running out of fuel and sucking up debris). You might need to drain and clean the tank.
* Fuel Filter Clogged: A clogged fuel filter will prevent fuel from reaching the engine, even if the system is primed. Replace the fuel filter.
* Injector Problems: Though less likely after running out of fuel, a faulty injector can also prevent starting. This requires professional diagnosis and repair.
* Check Fuel Lines for Blockages: Make sure there are no kinks or obstructions in the fuel lines.
Important Note: The specific procedure varies significantly between diesel models. Consult your owner's manual for the correct priming procedure for your vehicle. This information is a general guideline only, and improper priming can damage your engine. If you are unsure, seek help from a qualified mechanic.
