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The connection of any electrical equipment and the disconnection of any electrical equipment may cause an explosion hazard which may result in injury or death. Do not connect any electrical equipment or disconnect any electrical equipment in an explosive atmosphere. |
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Probable Causes
- Unit injectors
- Fuel supply
- Accessory equipment
Recommended Actions
Unit Injectors
- Check for correct installation of the J1/P1 and J2/P2 connectors for the Electronic Control Module (ECM). Check for correct installation of the connectors for the unit injectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
- Perform the "Injector Solenoid Test" with the Caterpillar Electronic Technician (ET) in order to determine if all of the injector solenoids are being energized by the ECM.
- Perform the "Cylinder Cutout Test" with Cat ET in order to identify any injectors that might be misfiring. Refer to Troubleshooting, "Injector Solenoid Circuit - Test" for the proper procedure.
Fuel Supply
- Check the pressure of the low pressure fuel system during engine cranking. Check the pressure while the engine is running. Refer to Systems Operation/Testing and Adjusting, "Fuel System Pressure - Test" for the correct procedure.
- Check the fuel lines for the following problems: restrictions, collapsed lines and pinched lines. If problems are found with the fuel lines, repair the lines and/or replace the lines.
- Check the fuel tank for debris which may block the fuel supply.
- Check for air in the low pressure fuel supply system if any of the following procedures have been performed:
- Replacement of the fuel filters
- Service on the low pressure fuel supply circuit
- Replacement of unit injectors
Note: A sight glass in the low pressure supply line is helpful in diagnosing air in the fuel. Refer to Systems Operation/Testing and Adjusting, "Air in Fuel - Test" for more information.
- Replacement of the fuel filters
- Purge air from the low pressure fuel supply circuit. Refer to Operation and Maintenance Manual, "Fuel System - Prime" for the correct procedure.
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Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again. |
- Check fuel quality. In temperatures below 0 °C (32 °F), check for solidified fuel (wax). Refer to Operation and Maintenance Manual for information on cold weather operation.
Accessory Equipment
Check all accessory equipment for problems that may create excessive load on the engine. Repair any damaged components or replace any damaged components.