GUARD GP-RADIATOR 9K1409 - Caterpillar

Electronic Control Module (ECM) detects an abnormal fuel filter differential pressure.Use this procedure in order to troubleshoot a problem with the fuel filters. Also, use this procedure if one of the following event codes are active or logged.
Table 1
Code and Description Conditions which Generate This Code System Response
95-0
Engine Fuel Filter Differential Pressure : High - most severe (3) The difference between the filtered fuel pressure and the unfiltered fuel pressure is greater than the trip point pressure. The code is logged. Probable Causes
Fuel filter
Fuel system restrictionRecommended Action
Note: Change the primary filter, and the secondary filter at the same time. Use clean fuel on the stud threads of filter base to reduce friction.Note: Do not fill the canister or the fuel filter before installation. The fuel can carry debris into the fuel filter and the fuel system may be damaged. The electric priming pump is designed to purge the trapped air in the new filters.
Table 2
Troubleshooting Test Steps Values Results
1. Change the Fuel Filters
A. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position. Change both the primary and secondary fuel filters.
B. Prime the system with the electric priming pump. Refer to Testing and Adjusting, "Fuel System - Prime".
C. Start the engine and allow the engine to idle for few minutes.
Fuel filter
Result: A code is not active or logged.
Return to service.
Result: The event code becomes active after changing the fuel filters.
Repair: The problem may be electrical, refer to Troubleshooting, "Sensor Signal (Analog, Active)" for additional information.
If the problem is not resolved, proceed to Test Step 2.
2. Check the Fuel System Restriction
A. Connect Cat® Electronic Technician (Cat ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Start the engine.
C. Monitor the "Low Pressure Fuel Circuit Pressure" for the fuel inlet restriction. The maximum restriction is 30 kPa (121 inch of H2O).
Fuel system restriction
Result: The fuel inlet restriction is within specification.
STOP
Result: The fuel inlet restriction is above the maximum limit.
Repair: Eliminate the restrictions in the vessel fuel piping. Avoid using 90 degree elbows.
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).