1. Add Fuel: First and foremost, add diesel fuel to the tank. Don't just add a little; fill it up at least halfway to ensure sufficient fuel supply.
2. Check the Fuel Filter: If your truck has a manually primed fuel filter (many do), locate it (usually near the engine). It may have a small lever or pump on top. If so, work this lever or pump repeatedly until you see firm resistance and feel fuel passing through. If the filter is old or clogged, it needs to be replaced. A clogged filter is a common cause of difficult starting even after priming.
3. Bleed the Fuel System (This is crucial): This step varies slightly depending on your specific model and fuel system configuration (single vs. dual tank, etc.). However, the general principle is the same: remove air from the lines. Look for these components and bleed them one by one:
* Water Separator (If equipped): Many fuel systems incorporate a water separator with a drain valve. Drain this completely to remove any water or trapped air.
* Fuel Filter (If it doesn't have a manual primer): Some fuel filters might require bleeding. You might find a bleed screw on top of the filter housing. Loosen this slightly, and crank the engine (using the starter, not the key in the run position) for short intervals to help push air out. Tighten the screw once fuel starts to come out steadily.
* Lift Pump (If equipped): Some models have a hand-priming lever or bulb on the fuel lift pump. If you have one, pump repeatedly until you feel resistance and see fuel flowing through the lines.
* Injector Lines (Hardest Part): This is the most tedious part. On some models, you can manually crack the fittings on the injector lines (one at a time!) at the injectors themselves. You'll need a wrench to loosen them slightly. Have rags ready to catch leaking fuel. Crank the engine (in short bursts using the starter) until fuel starts flowing cleanly from each line. Tighten the fittings once fuel flows steadily. Be very careful not to over-tighten these! This process can take some time.
* Fuel Rail: You might find a bleeder valve on the fuel rail itself. If so, follow the same procedure as for the fuel filter bleed screw.
4. Attempt to Start: After completing all bleeding steps, try starting the engine. It might take a few attempts. If it doesn't start immediately, repeat the priming steps, focusing on any areas where you noticed less fuel flow.
5. Seek Professional Help: If you've tried these steps multiple times and still can't get the engine to run, it's best to seek professional help. There might be a more serious problem with the fuel system, such as a faulty fuel pump, injector failure, or a more significant air leak.
Important Safety Precautions:
* Diesel Fuel is Flammable: Keep away from open flames and sparks.
* Fuel is Toxic: Wear gloves and eye protection when handling diesel fuel.
* Work in a Well-Ventilated Area: Diesel fumes can be harmful.
* Use Correct Tools: Use the appropriate size wrenches to avoid stripping bolts.
This process requires patience and persistence. If you're not comfortable working on your vehicle's fuel system, it's best to call a qualified mechanic. Remember to consult your owner's manual for specific instructions relevant to your particular model of F350.
