Section 12.2 Aerated Fuel

Section 12.2
Aerated Fuel

To determine if aerated fuel is causing rough running or stalling, perform the following steps:‪

  1. Disconnect the fuel line return hose from the fitting at the fuel tank; refer to OEM guidelines.
  2. Place the open end of the fuel line into a suitable container.
    warning

    PERSONAL INJURY

    To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

  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.
    1. If air bubbles are present, shut down the engine; refer to "12.2.1 Aerated Fuel Resolution" .
    2. If air bubbles are not present, shut down the engine. Check for high fuel temperature return, which would be an indication of insufficient fuel flow.

Section 12.2.1
Aerated Fuel Resolution

Perform the following steps 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 for leaks between fuel tank and fuel pump.
  3. Repair damaged components as required; refer to OEM guidelines.
  4. Verify aerated fuel resolution; refer to "12.2.1.1 Test the Engine with Aerated Fuel Resolution" .
Section 12.2.1.1
Test the Engine with Aerated Fuel Resolution

Perform the following to determine if aerated fuel resolution has resolved rough running or stalling condition:‪

warning

PERSONAL INJURY

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

  1. Start and run the engine.
  2. Run the engine at idle with a no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range.
  3. Test for rough running condition.
    1. If the engine appears normal, no further troubleshooting is required. Shut down the engine.
    2. If the engine is still running rough, shut down the engine. Check for insufficient fuel flow. Refer to "12.3 Insufficient Fuel Flow" .


EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568
Generated on 10-13-2008

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