1. Refuel: This seems obvious, but make sure you've filled the tank completely. Diesel engines are particularly sensitive to air in the fuel lines.
2. Bleed the Fuel System: This is the crucial step. Air in the fuel lines prevents fuel from reaching the injectors. The bleeding procedure varies greatly depending on the make and model of your tractor. Consult your tractor's operator's manual. This manual will detail the specific locations of bleed screws or valves and the correct bleeding procedure. Generally, you'll need to:
* Locate the bleed screws/valves: These are typically found on the fuel filter, fuel pump, and possibly injector lines.
* Open the bleed screws/valves: Use a wrench (often a small one) to carefully open them.
* Crack them open slowly: You want to allow air to escape, but not too quickly.
* Pump the fuel primer bulb (if equipped): Many tractors have a hand primer bulb to assist in getting fuel flowing. Pump this repeatedly.
* Tighten the screws/valves: Once a steady stream of fuel, free of air bubbles, comes out, tighten the bleed screws/valves.
* Repeat for all bleed points: Go through each bleed point in the order specified in your manual.
3. Try to Start: After bleeding the fuel system, try cranking the engine. It might take a few tries.
4. Check for Other Issues (if it still won't start): If it still doesn't start after properly bleeding the system, consider these possibilities:
* Low Battery: A weak battery might not provide enough power to crank the engine. Try jump-starting it.
* Glow Plugs (for older models): If your tractor has glow plugs, ensure they're functioning correctly, especially in cold weather. These assist in ignition.
* Fuel Filter: A clogged fuel filter can also prevent fuel from reaching the injectors. Replace or clean the filter as needed.
* Fuel Pump: A faulty fuel pump might not be able to move fuel through the system.
* Air in the Fuel Tank: Make sure there's no significant amount of air trapped in the tank. Sometimes a partially full tank can draw in more air than expected.
Important Safety Precautions:
* Diesel fuel is flammable: Avoid smoking or open flames while working on the fuel system.
* Use appropriate tools: Don't use the wrong size wrenches, as you could damage the bleed screws.
* Consult your manual: The procedures described here are general. Always refer to your tractor's operator's manual for the specific instructions for your model.
If you're not comfortable performing these steps yourself, it's best to call a qualified mechanic. Improperly bleeding the fuel system can damage your tractor's engine.
