Fuel System:
* Fuel filter: A clogged fuel filter can restrict fuel flow, causing the engine to die under load but start fine when the filter has time to refill.
* Fuel pump: A failing fuel pump might not deliver sufficient fuel pressure under load. The pump might work well enough to start the engine but struggle to maintain pressure when the engine is under strain.
* Fuel lines and injectors: Clogged or restricted fuel lines or faulty injectors can similarly cause fuel starvation under load.
* Water in fuel: Water in the fuel can cause the engine to stall, especially under load.
* Fuel pressure regulator: A faulty fuel pressure regulator can cause inconsistent fuel pressure, leading to engine stalling.
* Fuel shutoff solenoid: This solenoid, which controls fuel flow, can malfunction and prevent fuel from reaching the injectors.
* Fuel tank vent: A blocked vent can prevent the tank from equalizing pressure, leading to fuel starvation.
Other Possibilities:
* Air intake: A restricted air intake, such as a clogged air filter or a leak in the intake manifold, can cause the engine to run lean and stall.
* Electrical issues: A faulty sensor, wiring problem, or faulty ignition system (even in a diesel) could cause the engine to die. Check the crankshaft position sensor, camshaft position sensor, and other electrical components related to fuel delivery.
* Engine load: The issue might be related to the load on the engine. If the engine is consistently dying under high load, the problem could be in the engine's mechanical components, such as the turbocharger, exhaust system, or even the engine's internal workings.
* Fuel type: Make sure you're using the correct type of fuel for your multi-fuel engine. Using the wrong fuel can cause performance issues and potentially engine damage.
Troubleshooting Steps:
1. Inspect the fuel filter: Check for debris or discoloration, indicating a clogged filter. Replace if necessary.
2. Test fuel pressure: Check the fuel pressure at the fuel rail while the engine is running. Low pressure indicates a problem with the fuel pump, regulator, or lines.
3. Inspect fuel lines and injectors: Look for any signs of leaks, blockages, or corrosion.
4. Check for water in the fuel: Drain some fuel from the tank and check for water contamination.
5. Inspect the air intake: Ensure the air filter is clean and there are no leaks in the intake system.
6. Diagnose electrical components: Check for faulty sensors, wiring issues, or problems with the ignition system.
Professional Help:
If you're unable to identify the cause of the problem, it's best to consult a qualified diesel mechanic. They have the tools and experience to properly diagnose the issue and perform necessary repairs.
Remember, safety is paramount when working with diesel engines. Always follow proper safety procedures and consult a professional if you are unsure about any aspect of the repair process.
