1. Prime the Fuel System: This is the most crucial step. There are several ways to do this, depending on your truck's specific setup:
* Manual Priming Pump (if equipped): Many 7.3L Powerstrokes have a hand-priming pump near the fuel filter. Repeatedly pump this until you feel firm resistance and see fuel flowing freely. You might need to do this for a considerable time.
* Electric Fuel Pump (if equipped): Some systems have an electric lift pump that you might be able to activate directly. Consult your owner's manual or a wiring diagram to see if there is a way to manually energize this pump (often a diagnostic connector).
* Gravity Bleed: If you have access to the fuel filter, you can loosen the bleeder screw on the top. Gravity will help to pull fuel through. Tighten it once fuel flows freely. Repeat this for any other bleed points along the fuel line.
2. Check the Fuel Filter:
* Inspect for Leaks: Ensure there are no leaks at the fuel filter connections. If you have leaks, you'll need to replace the filter or fix the leaks before proceeding.
* Water in Fuel: Water in the fuel can cause starting problems. If you suspect water, you need to drain the water from the fuel filter.
3. Check the Fuel Tank:
* Low Fuel Sensor: Verify that the low fuel light is indeed working correctly, especially if you were close to empty before running out of gas.
* Debris in Tank: It's rare, but debris could be obstructing the fuel pickup in the tank.
4. Crank the Engine (Repeatedly):
* After priming the system, try cranking the engine for several seconds, then pause for a few seconds to avoid overheating the starter. Repeat this process several times. This allows the fuel system to fill with fuel gradually.
5. Check for other issues (if priming doesn't work):
* Low Voltage: If the battery is weak, it might not be able to adequately power the fuel pump or starter. Check the battery voltage.
* Fuel Solenoid: If your truck has a fuel solenoid, ensure it's working properly. This solenoid controls fuel flow to the injectors.
* Injector Issues: While less likely to be caused directly by running out of fuel, worn or malfunctioning injectors could prevent the engine from starting.
* Glow Plugs (for cold weather): If it's cold outside, defective glow plugs could hinder starting.
If you've tried these steps and the truck still won't start, you'll likely need professional help from a diesel mechanic. They have specialized tools and knowledge to diagnose more complex fuel system problems. Trying to force fuel with compressed air is generally discouraged as it can damage the injectors.
