Symptom Tree
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Fuel level is low in the tank |
Fill the supply tank. Refer to the OEM service manual. |
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Electronic fault codes are active |
For instructions on how to read active fault codes, refer to Diagnostic Fault Codes in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility. |
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Fuel supply line restriction between the fuel pump and the injectors |
Check the fuel supply line from the fuel pump to the cylinder head for sharp bends that can cause restrictions. Refer to a Cummins Authorized Repair Facility. |
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Air in the fuel system |
Check for air in the fuel system. Tighten or replace the fuel connections, fuel lines, fuel tank standpipe, and fuel filters as necessary. |
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Vehicle parasitics are excessive |
Check the vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time, and engine-driven units. Refer to the OEM service manual. |
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Fuel grade is notcorrect for the application, or the fuel quality is poor |
Operate the engine from a tank of high-quality fuel. Refer to Section V. |
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| Contact a Cummins Authorized Repair Facility |
