|
High Fuel Pressure
|
Overview
| CODE | REASON | EFFECT |
| Fault Code: 449 PID: P094 SPN: 94 FMI: 0/16 LAMP: Yellow SRT: |
Excessive fuel supply pressure was detected at the fuel pressure sensor. |
Engine will have black smoke and will run derated. |
 Hydraulic Fuel System Circuit
|
Circuit Description
The gear pump draws fuel from the fuel tank through the fuel filter and antidrainback valve. The gear pump develops 100 to 320 psi of fuel pressure. The fuel flows through the fuel filter screen and fuel shutoff valve to the fueling and timing actuators and the fuel pressure sensor. The 250-psi regulator controls the fuel pressure.
Component Location
|
Hydraulic Fuel System Circuit Callouts
|
|||||||
|
1
|
320-psi Pressure Regulator
|
5
|
Quick-Disconnect Pressure Tap-Suction Side
|
9
|
Fuel Pressure Sensor
|
13
|
Rear Timing Actuator
|
|
2
|
36-mc Filter Screen
|
6
|
WIF Sensor
|
10
|
Quick-Disconnect Pressure Tap-Pressure Side
|
14
|
Rear Rail Actuator
|
|
3
|
Fuel Inlet Restriction Sensor
|
7
|
250-psi Pressure Regulator
|
11
|
Front Rail Actuator
|
||
|
4
|
Fuel Inlet
|
8
|
Fuel Shutoff Valve
|
12
|
Front Timing Actuator
|
The 250-psi regulator controls the fuel pressure. All components are located on the fuel delivery housing on the intake side of the engine.
Shop Talk
The fuel pressure is monitored by the ECM. If the fuel pressure is outside an acceptable range, the fault code is activated. The acceptable range of the fuel pressure can be viewed as Minimum Fuel Pressure and Maximum Fuel Pressure using the INSITE™ monitor screen. The fault will log quickly for large differences and slower for small differences.
Refer to Troubleshooting Fault Code t05-449.
;){kind=link}
;){kind=link}