KIT-SEAT 4940060 - Caterpillar

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Fuel supply lines for inspection
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Duplex Fuel Filters and Supply Lines Front View (If Equipped)
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Duplex Fuel Filters and Supply Lines Rear View (If Equipped)
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Cooling line from fuel high-pressure pump to injectors
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Fuel return line to be inspected
Table 4
Troubleshooting Test Steps Values Results
3. Inspect the Fuel Supply Lines
A. Visually inspect the fuel lines between the priming pump and the inlet to the cylinder head. Also, inspect the fuel cooler (if equipped) for dirt, debris, or damage. Inspect the fuel return line from the head to the fuel tank. Inspect the lines for restrictions, pinching, and swelling. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect" for additional information.
B. Inspect the fuel cooler for dirt, debris, or damage.
Fuel Supply Lines
Result: The fuel lines and the cooler (if equipped) are OK.
Proceed to Test Step 4.
Result: The fuel lines and the cooler (if equipped) are not OK.
Repair: Replace damaged fuel lines and/or fuel cooler. Remove dirt or debris from fuel cooler fins. Verify that the problem has been resolved.
If the problem has not been resolved, proceed to Test Step 4.
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Fuel cooler (If Equipped)
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(1) Fuel temperature sensor
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Duplex Fuel System
(2) Pre Filter Pressure Sensor
(3) Post Filter Temperature Sensor
(4) Post Filter Pressure
Table 5
Troubleshooting Test Steps Values Results
4. Replace the Temperature Sensor
A. Replace fuel temperature sensor (1).
B. Check for active codes or logged codes.
Fuel Temperature Sensor
Result: A 174 code is active or logged.
Proceed to Test Step 5.
Result: A 174 code is not active or logged. Return the unit to service.
If the problem is not resolved, proceed to Test Step 5.
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(5) Fuel return pressure regulator
Table 6
Troubleshooting Test Steps Values Results
5. Replace the Fuel Return Pressure Regulator
A. Replace the fuel return pressure regulator (2). Verify that the problem has been resolved.
Fuel Pressure Regulator
Result: The problem has not been resolved.
Proceed to Test Step 6.
Result: The problem has been resolved. Return the unit to service.
6. Perform a Fuel System Verification Test
A. Perform a "Fuel System Verification Test" in Cat ET.
Fuel System verification Test
Result: The "Fuel System Verification Test" was not successful.
Repair: Replace the identified injectors. Verify that all trim files are installed into the ECM correctly. Refer to Troubleshooting, "Injector Trim File - Install". Repeat the "Fuel System Verification Test" after making the necessary repairs. Repeat the process until all the injectors are operating properly.
Result: The "Fuel System Verification Test" was successful. Return the unit to service.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).