Fuel Pressure Is High
Use this procedure to troubleshoot high fuel pressure. Also, use this procedure if the following event code is active or logged.
Show/hide table
J1939 Code and Description | CDL Code and Description | Comments |
---|---|---|
94-16
Engine Fuel Delivery Pressure : High - moderate severity (2) |
E1218 (2)
High Unfiltered Fuel Pressure |
The fuel pressure before the secondary filter is higher than expected. |
Show/hide table
Associated Codes | ||
---|---|---|
J1939 Code | CDL Code | Troubleshooting Procedure |
95-0 | E390 (3) | Troubleshooting, "Fuel Filter Is Restricted" |
95-15 | E390 (1) | Troubleshooting, "Fuel Filter Is Restricted" |
95-16 | E390 (2) | Troubleshooting, "Fuel Filter Is Restricted" |
- Codes
- Starting priority valve
- Low-pressure regulator
- Supply orifice
- Back-pressure regulator
- Fuel cooler
Show/hide table
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. Troubleshoot any associated codes before continuing with this test. Result: A code is active or logged. Proceed to Test Step 2. |
Show/hide table
Illustration 1 | g06213432 |
(1) Starting priority valve
(2) System pressure regulator |
Show/hide table
Troubleshooting Test Steps | Values | Results |
---|---|---|
2. Check the Starting Priority Valve A. Turn the keyswitch to the OFF position. B. Remove the starting priority valve from the secondary fuel filter head. Refer to Disassembly and Assembly manual for additional information. C. Check the starting priority valve operation by actuating the spool within the cartridge assembly. |
Priority Valve |
Result: The starting priority valve moves freely through the full travel. Reinstall the starting priority valve. Proceed to Test Step 3. Result: The starting priority valve does NOT freely move through the full travel. Repair: Replace the starting priority valve. Proceed to Test Step 8. |
3. Check the Low-Pressure Fuel System Pressure Regulator A. Turn the keyswitch to the OFF position. B. Remove the low-pressure fuel system pressure regulator from the secondary fuel filter auxiliary manifold. Refer to Disassembly and Assembly manual for additional information. C. Check the low-pressure fuel system pressure regulator by actuating the spool within the cartridge assembly. |
Pressure Regulator |
Result: The low-pressure fuel system pressure regulator moves freely through the full travel. Reinstall the low-pressure fuel system pressure regulator. Proceed to Test Step 4. Result: The low-pressure fuel system pressure regulator does NOT freely move through the full travel. Repair: Replace the low-pressure fuel system pressure regulator. Proceed to Test Step 8. |
Show/hide table
Illustration 2 | g06214136 |
(3) Injector cooling orifice fitting |
Show/hide table
Troubleshooting Test Steps | Values | Results |
---|---|---|
4. Check the Injector Cooling Supply Orifice A. Turn the keyswitch to the OFF position. B. Disconnect the injector cooling supply line from the secondary fuel filter head. C. Remove the orifice from the secondary fuel filter head. Refer to Disassembly and Assembly manual for additional information. D. Inspect the injector cooling supply orifice. |
Blockage |
Result: The injector cooling supply orifice was NOT blocked. Reinstall the injector cooling supply orifice. Proceed to Test Step 5. Result: The injector cooling supply orifice was blocked. Repair: Clean the blockage from the injector cooling supply orifice. Proceed to Test Step 7. |
Show/hide table
Illustration 3 | g06214141 |
Injector cooling back-pressure regulator (4) Pressure regulator |
Show/hide table
Troubleshooting Test Steps | Values | Results |
---|---|---|
5. Check the Injector Back-pressure Regulator A. Turn the keyswitch to the OFF position. B. Remove Injector back-pressure regulator from the low-pressure injector cooling manifold in the fuel cooling rail. Refer to Disassembly and Assembly manual for additional information. C. Check the Injector back-pressure regulator by actuating the spool within the cartridge assembly. |
Back-pressure Regulator |
Result: The Injector back-pressure regulator moves freely through the full travel. Reinstall the injector back-pressure regulator. Proceed to Test Step 6. Result: The injector back-pressure regulator does NOT freely move through the full travel. Repair: Replace the injector back-pressure regulator. Proceed to Test Step 7. |
6. Check the Fuel Cooler A. Turn the keyswitch to the OFF position. B. Install a pressure gauge in the fuel return line between the high-pressure fuel return line and the customer connection to the fuel cooler and fuel tank. C. Start the engine. D. Run the engine until normal operating temperature has been reached. E. Bring the engine to high idle. |
Restriction |
Result: The pressure was less than Proceed to Test Step 7. Result: The pressure was greater than Repair: Replace the fuel cooler. Proceed to Test Step 7. |
7. Check for Codes A. Start the engine. B. Run the engine until normal operating temperature has been 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).
Caterpillar Information System:
3500E EPA Tier 4 Final and IMO-II/III Switchable Marine Engines Sensor Signal (PWM) - Test
C13 Industrial Engine Product Storage
G3520H Generator Set Engine Engine Oil Pump - Assemble
458-7125 Top End Overhaul Foundational Kit for 3508 Petroleum Engines{1000} 458-7125 Top End Overhaul Foundational Kit for 3508 Petroleum Engines{1000}
150T Track Repair Group Field Follow Tools, Operation, and Parts {0374, 0700, 0729, 4169, 4170, 4171} 150T Track Repair Group Field Follow Tools, Operation, and Parts {0374, 0700, 0729, 4169, 4170, 4171}
2014/12/05 Cat® Reman Announces The Availability of a Multitude of Electronic Control Groups {1901}
2014/10/14 Cat® Reman Now Offers Additional Control Modules for Certain Machine Engines {1901, 7610}
C13 Industrial Engine Maintenance Interval Schedule - Standard
C13 Industrial Engine Engine Stopping
320 GC, 320 and 323 Excavator Machine Systems Specifications Track
323F SA and 323F LN Excavator and 323F LN MHPU Machine Systems Specifications Coupler Lines
Valve Cover Base Threaded Insert Repair {0599, 0676, 0700, 0701, 1107} Valve Cover Base Threaded Insert Repair {0599, 0676, 0700, 0701, 1107}
794 AC Off-Highway Truck Engine Supplement Radiator - Remove and Install
C3.4B Engines Speed/Timing - Test
C280 Marine Engines Turbocharger Differential Speed Problem
458-7290 Major Overhaul Foundational Kit for 3508 Petroleum Engines{1000} 458-7290 Major Overhaul Foundational Kit for 3508 Petroleum Engines{1000}
C175-16 Locomotive Engine Aftertreatment Identification Module - Test
C3.4B Engines Switch Circuits - Test - Air Filter Restriction Switch
2014/10/10 An Improved Damper Group Is Used on Certain C175 Marine, Petroleum, and Locomotive Engines {1205}
C3.4B Engines Switch Circuits - Test - Engine Oil Pressure Switch
C280 Marine Engines Data Link - Test
New Exhaust Risers Are Now Used on Certain C32 Marine Engines {1059, 1362} New Exhaust Risers Are Now Used on Certain C32 Marine Engines {1059, 1362}
459-1185 Major Overhaul Foundational Kit for 3508 Petroleum Engines{1000} 459-1185 Major Overhaul Foundational Kit for 3508 Petroleum Engines{1000}
C32 Petroleum Generator Sets Maintenance Interval Schedule - Prime