To determine if an improper grade of fuel oil is causing excessive white smoke, perform the following:
- Acquire a fuel oil sample from the vehicle fuel tank(s).
- Submit fuel oil sample for an ASTM test analysis.
- If the fuel oil meets specifications, check the fuel pump;
- If the fuel oil did not meet specifications, resolve improper grade of fuel;
Improper Grade of Fuel Resolution
Perform the following steps to resolve the improper grade of fuel oil:
- Drain the fuel oil tank(s), refer to OEM guidelines, and dispose of properly.
- Refill the fuel oil tanks with new fuel oil having a cetane number greater than 40.
- Verify fuel oil resolution;
Test the Engine with New Fuel Oil
Perform the following steps to determine if the new fuel oil refill resolved the excessive white smoke condition:
- Start and run the engine.
- Run the engine at idle with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
- Visually inspect exhaust for excessive smoke.
- If the engine exhaust smoke emission appears normal, no further troubleshooting is required. Shut down the engine.
- If the engine exhaust smoke is excessively white, shut down the engine. Check the fuel pump;