SPACER 8D9688 - Caterpillar

System Operation Description:The probable causes of high fuel pressure
Fuel pressure sensors
Fuel lines
Fuel transfer pump
Fuel return pressure regulatorUse this procedure in order to troubleshoot high fuel pressure. Use this procedure if the following event code 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
Diagnostic Trouble Codes    
J1939 Code     CDL Code     Code Description     Comments    
94-16     E1218 (2)     High Unfiltered Fuel Pressure     The code is logged.
The fuel pressure is above the trip point pressure.    
Table 2
Associated Diagnostic Trouble Codes    
J1939 Code     CDL Code    
5584     E390    
Table 3
Troubleshooting Test Steps    Values    Results    
1. Determine the Code
A. Connect Cat® Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Warranty Report" from the engine Electronic Control Module (ECM) before performing any troubleshooting or clearing diagnostic trouble codes.
C. Determine if a diagnostic trouble code is present.
   
Codes    
Result: An E1218 (2) code is present.
Proceed to Test Step 2.
Result: A code other than a E1218 (2) code is present.
Repair: Troubleshoot the code. Refer to the proper troubleshooting procedure.
STOP
   
Illustration 1 g03779504
(1) Fuel temperature sensor (2) Fuel pressure sensor "A" (3) Fuel pressure sensor "B" (4) Fuel filter base
Table 4
Troubleshooting Test Steps    Values    Results    
2. Check Fuel Pressure Sensor "A"
A. Record the unfiltered fuel pressure from Cat ET. Record the value in Table 6.
B. Remove fuel pressure sensor "A" (2) .
C. Install a 5P-1318 Adapter into the port of the pressure sensor "A" (2) .
D. Install the 123-0783 Fluid Sampling Valve Gp onto the 5P-1318 Adapter .
E. Install a 8T-0855 Pressure Gauge onto a 6V-3990 Coupler .
F. Install the 6V-3990 Coupler onto the 123-0783 Fluid Sampling Valve Gp .
G. Record the fuel pressure from the pressure gauge. Record the pressure in Table 6.
   
Pressure Sensor    
Result: The gauge value of the fuel pressure is within 69 kPa (10 psi) of the unfiltered fuel pressure reading shown in Cat ET.
Proceed to Test Step 3.
Result: The gauge value of the fuel pressure is not within
69 kPa (10 psi) of the unfiltered fuel pressure reading shown in Cat ET.
Repair: Replace the pressure sensor. Verify that the problem has been resolved.
If the problem is not resolved, proceed to Test Step 3.
   
Table 5
Required Tooling for Pressure Sensor "A"    
5P-1318 Adapter    
123-0783 Fluid Sampling Valve Gp    
8T-0855 Pressure Gauge    
6V-3990 Coupler    
Table 6
Engine RPM     Unfiltered fuel pressure from Cat ET     Fuel pressure from the mechanical gauge    
800            
1800            
Illustration 2 g02041759
Fuel supply lines
Illustration 3 g02041781
Fuel return line
Table 7
Troubleshooting Test Steps    Values    Results    
3. Inspect the Fuel Supply and Return Lines
A. Visually inspect the fuel lines between the primary filter base and the inlet to the fuel injection pump. Also, inspect the fuel