1. Refuel: This seems obvious, but make sure you completely fill the tank. A partially full tank can still lead to air in the system. Use clean diesel fuel.
2. Prime the System (This is the crucial step): The 7.3 Power Stroke uses a lift pump to draw fuel from the tank to the injection pump. If you've run out of fuel, this pump needs help to get fuel flowing again. There are several ways to do this:
* Using the Hand Primer Bulb (If equipped): Many 7.3s have a hand primer bulb near the fuel filter. Repeatedly pump this bulb until you see firm resistance and fuel is flowing through the lines. You should see fuel flowing through the clear fuel lines, if equipped.
* Manually Bleed the Fuel System (More involved): If you don't have a hand primer, or it's not working, you'll likely need to bleed the system manually. This involves loosening the bleeder screws on the fuel filter housing and injection pump. You'll need to crank the engine periodically while someone else cracks and tightens these screws until you see clean, bubble-free fuel coming out of the bleeders. This is messy, and may require a helper. Consult your vehicle's repair manual for the exact location of these bleeders and the correct procedure. *It's also crucial to tighten them after bleeding*.
3. Attempt to Start: After priming or bleeding, attempt to crank the engine. It might take a few tries as the fuel system re-pressurizes. Do not crank for extended periods. This can damage the starter.
4. Check for Other Issues: If it still doesn't start after priming/bleeding, consider these possibilities:
* Fuel Filter: A clogged fuel filter can prevent fuel flow even after priming. Replace the filter if it's old or suspect.
* Lift Pump: The lift pump itself may be faulty. This is less common but possible.
* Water in the Fuel: Water in the fuel system can hinder starting.
* Other Electrical or Mechanical Problems: Running out of fuel is sometimes a symptom of another problem, especially if this happens frequently.
Important Considerations:
* Consult your owner's manual: Your manual will provide specific instructions for priming or bleeding your 7.3's fuel system.
* Safety: Diesel fuel is flammable. Avoid working near open flames or sparks.
* Professional Help: If you're uncomfortable performing these steps, take your truck to a qualified mechanic.
Running a diesel engine out of fuel can be problematic. Thorough priming and potentially bleeding the system are key to getting it running again. Don't rush the process; take your time and be systematic.
