Series 50 – Section 23.3 Aerated Fuel

Section 23.3
Aerated Fuel

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 guidelines.
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 r/min.
5. Visually check to see if air bubbles are rising to the surface of the fuel within the container.
   1. If air bubbles are present, shut down engine; refer to "23.3.1 Aerated Fuel Resolution" .
   2. If air bubbles are not present, shut down engine, check for improper injector calibration setting; refer to "23.4 Improper Injector Calibration Setting (DDEC III Engines Only)" .

Section 23.3.1
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 guidelines.
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 "23.3.1.1 Test Engine with Aerated Fuel Resolution" .

Section 23.3.1.1
Test Engine with Aerated Fuel Resolution

Perform the following to determine if aerated fuel resolution resolved excessive white smoke condition: ‪

1. 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.
   1. If the engine exhaust emission appears normal, no further troubleshooting is required. Shut the engine down.
   2. If the engine exhaust emission is excessively white, shut the engine down. Check for improper injector calibration setting; refer to "23.4 Improper Injector Calibration Setting (DDEC III Engines Only)" .