What to do when your diesel engine stalls after running out of fuel and cannot start after refuelling

If your diesel engine stalls after running out of fuel and is having difficulty starting even after refilling the tank, here are some steps you can take:

1. Prime the Fuel System: The fuel system may need to be primed to remove any air that entered the system when it ran out of fuel. Locate the fuel primer pump (often a hand-operated pump) and pump it until resistance is felt. This helps to circulate fuel and remove air bubbles from the system.

2. Bleed the Fuel System: Air may have entered the fuel system, causing a blockage and preventing the engine from starting. Consult your vehicle’s manual to locate the fuel system bleeding points. Use the provided bleed screws or valves to release air from the fuel system. Start at the fuel filter and work your way toward the injectors, following the specific bleeding procedure for your engine. This process will ensure that only fuel, without any air, is entering the engine.

3. Check Fuel Lines: Inspect the fuel lines for any leaks or blockages that may be hindering fuel flow. Ensure that all connections are secure and tighten them if necessary. Replace any damaged or worn fuel lines.

4. Check Fuel Filters: Diesel engines typically have primary and secondary fuel filters. Check both filters to ensure they are not clogged with debris or sediment. If they are dirty or clogged, replace them according to the manufacturer’s recommendations.

5. Check the Fuel Pump: The fuel pump may have been damaged due to running on an empty tank. Verify that the fuel pump is functioning properly. If it is not delivering an adequate amount of fuel, it may need to be repaired or replaced.

6. Purge Air from the Injectors: Air may have entered the fuel injectors, which can prevent proper fuel delivery. Follow the manufacturer’s instructions to purge air from the injectors. This usually involves loosening the injector pipes and cranking the engine until fuel sprays out without any air bubbles. Once the fuel flows consistently, tighten the injector pipes securely.

7. Try Starting Fluid: If the engine still doesn’t start, you can try using a small amount of starting fluid (ether) as a temporary measure. Follow the instructions on the starting fluid canister carefully, as using too much can be dangerous. Spray a small amount into the air intake or directly into the engine’s air filter housing while attempting to start the engine. If the engine starts with starting fluid, it indicates a fuel delivery problem that requires further investigation.

If you’ve gone through these steps and the engine still doesn’t start or run smoothly, it’s advisable to consult a qualified mechanic or contact the vehicle manufacturer’s service centre for additional assistance.