SPRING 3P6669 - Caterpillar

System Operation Description:The probable causes of low fuel pressure
Fuel
Fuel Tank
Fuel Filters
Fuel Transfer Pump
Fuel Pressure Sensor
Fuel Return Pressure Regulator
Fuel LinesUse this procedure in order to troubleshoot a low fuel pressure. Use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".
Table 1
Event Code    
CDL Code    J1939 Code    Code Description
(code descriptions may vary)    Comments    
E198 (1)     5580-17     Low Fuel Pressure     The code is logged.    
E198 (2)     5580-18     Low Fuel Pressure     The engine power is derated. The code is logged.
The ECM will illuminate the action lamp.    
Table 2
Troubleshooting Test Steps    Values    Results    
1. Determine the Code
A. Connect Cat ET to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Determine if a diagnostic trouble code is present.
   
Diagnostic trouble code
   
Result: A E198 or 5580 code is present.
Proceed to Test Step 2.
Result: A code other than E198 or 5580 code is present.
Troubleshoot the code. Refer to the proper troubleshooting procedure.
   
2. Check the Fuel Level in the Tank
A. Visually inspect the fuel level in the fuel tank. Ensure that the fuel tank contains enough fuel in order to operate the engine.
B. Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
   
Fuel level
   
Result: The fuel level is OK.
Proceed to Test Step 3.
Result: The fuel level is not OK.
Fill the tank. Verify that the problem has been resolved. If the problem is not resolved, proceed to Test Step 3.
   
3. Inspect the Fuel System for Leaks
A. Perform a visual inspection of the fuel system. Verify that there are no fuel leaks. Inspect the fuel lines from the fuel transfer pump to the secondary fuel filter base for restrictions.
   
Leaks
   
Result: No leaks were found.
Proceed to Test Step 4.
Result: Leaks were found in the fuel system.
Repair the leaks. Verify that the problem is resolved. If the problem is not resolved, proceed to Test Step 4.
   
Table 3
Required Tooling    
8T-7860 Connector    
110-6349 Fitting as    
8T-0855 Pressure Gauge    
6V-3990 Coupler    
Illustration 1 g02023390
(1) Fuel temperature sensor (2) Fuel sampling port (3) Fuel pressure sensor (4) Fuel filter base
Table 4
Engine RPM     Fuel pressure from Cat ET     Fuel pressure from the mechanical gauge    
800            
1800            Note: Do not use the fuel sampling port (2) for measuring the pressure. Follow the steps below.
Table 5
Troubleshooting Test Steps    Values    Results    
4. Check the Fuel Pressure Sensor
A. Record the fuel pressure from Cat ET. Record the data in Table 4.
B. Remove fuel pressure sensor (3) .
C. Install an 8T-7860 Connector into the port of the pressure sensor (3) .
D. Install the 110-6349 Fitting as onto the 8T-7860 Connector .
E. Install an 8T-0855 Pressure Gauge onto a 6V-3990 Coupler .
F. Install the 6V-3990 Coupler