To determine if aerated fuel is causing excessive white smoke, perform the following steps:
1. Disconnect the fuel line return hose from the fitting located at the fuel tank; refer to OEM
2. Place the open end of the fuel line into a suitable container.
3. Start and run the engine.
4. Operate the engine at 1000 rpm.
5. Visually check to see if air bubbles are rising to the surface of the fuel within the container.
[a] If air bubbles are present, shut down engine; refer to section 10.3.1.
[b] If air bubbles are not present, shut down engine, check for improper injector
calibration setting; refer to section 10.4.
Aerated Fuel Resolution
Perform the following to resolve aerated fuel:
1. Tighten all fuel line connections between fuel tank and fuel pump; refer to OEM
2. Visually inspect all fuel lines between fuel tank and fuel pump for leaks.
3. Repair damaged components as required; refer to OEM guidelines.
4. Verify aerated fuel resolution; refer to section 10.3.1.1.
Test the Engine with Aerated Fuel Resolution
Perform the following to determine if aerated fuel resolution resolved excessive white smoke
1. Refer to section 10.3 for the exhaust caution before proceeding. Start and run the engine.
2. Run the engine at idle with a no-load for approximately 5 minutes, allowing the engine
coolant to reach normal operating range.
3. Visually inspect exhaust for excessive white smoke.
[a] If the engine exhaust emission appears normal, no further troubleshooting is required.
Shut down the engine.
[b] If the engine exhaust emission is excessively white, shut down the engine. Check for
improper injector calibration setting; refer to section 10.4.