3512E Tier 4 Final Engines for Land Electric Drilling Caterpillar

Fuel Rail Pressure Problem

Usage:

Use this procedure to troubleshoot abnormal fuel rail pressure. Also, use this procedure if the following event code is active or logged.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
157-7 Engine Injector Metering Rail #1 Pressure : Not Responding Properly	E1069 (1) Fuel Rail #1 Pressure Not Responding	The engine fuel rail pressure sensor reading is unstable or incorrect.

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Table 2
Associated Codes
J1939 Code	CDL Code	Troubleshooting Procedure
1076-7	18-7	The actual position and the desired position of the fuel actuator is not within specifications. Replace the fuel control valve.
1381-17	E2172 (1)	Troubleshooting, "Fuel Transfer Pump Inlet Pressure Is Low"

Probable Causes

Codes
Air in fuel
Relief Valve

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Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.

Recommended Actions

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Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Connect Cat^® Electronic Technician (ET) to the service tool connector. B. Look for active codes that are associated with the system for the event code.	Codes	Result: An associated code is active. Repair: Troubleshoot any associated codes before continuing with this test. Result: A code is active or logged. Proceed to Test Step 2.
2. Check for Air in the Fuel A. Refer to Testing and Adjusting, "Air in Fuel" for additional information.	Air in Fuel	Result: There was NOT air in the fuel. Proceed to Test Step 3. Result: There was air in the fuel. Repair: Determine the cause of the air in the fuel. Repair as necessary. If the problem is not resolved, proceed to Test Step 4.

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Illustration 1	g06089463
High-Pressure Fuel Pump (1) Pump head (2) Valve block

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Table 4
3. Check the Fuel Pressure Relief Valve A. Start the engine. B. Run the engine until normal operating temperature is reached. C. Bring the engine to high idle. D. Use a 349-4203 Infrared Thermometer to measure the temperature difference between valve block (2) and pump head (1).	Temperature	Result: The temperature difference is less than 40° C (72° F). Repair: A failed fuel rail pressure sensor has been detected. Perform the following procedure: 1. Release the pressure in the high-pressure rail by loosening the end plug on one of the last two fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel. 2. Verify the "Fuel Rail Pressure" reading in Cat ET is 0 ± 8 MPa (0 ± 1160 psi) prior to servicing the fuel system. 3. Replace the fuel rail pressure sensor. Result: The temperature difference is more than 40° C (72° F). Repair: A failed high-pressure fuel pump has been detected. Perform the following procedure: 1. Release the pressure in the high-pressure rail by loosening the end plug on one of the last two fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel. 2. Verify the "Fuel Rail Pressure" reading in Cat ET is 0 ± 8 MPa (0 ± 1160 psi) prior to servicing the fuel system. 3. Replace the high-pressure fuel pump. If the problem is not resolved, proceed to Test Step 4.
4. Check for Codes A. Start the engine. B. Run the engine until normal operating temperature is reached. C. Bring the engine to high idle. D. Connect Cat ET. E. Use Cat ET to monitor the following: - Codes	Codes	Result: A code is not active. Return 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).