HUB 1043137 - Caterpillar

Use this procedure in order to troubleshoot a low fuel pressure, or use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Code List" for information about event codes and the default trip points for these codes. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes.
Table 1
Event Code    
Description    Default Conditions which Generate this Code    System Response    
E053(1) Low Fuel Pressure Warning     The fuel pressure drops below the trip point for the specified delay time.     The code is logged.    
E198(1) Low Fuel Pressure     The fuel pressure drops below
175 kPa (25 psi) for ten seconds.     The code is logged.    
E198(2) Low Fuel Pressure     The fuel pressure drops below
150 kPa (22 psi) for 15 seconds.     The code is logged.
The engine is derated.    Probable Causes
Fuel level
Fuel tank cap
Diagnostic codes and event codes
Fuel pressure sensors
Fuel pressure regulating valve
Fuel priming pump (if equipped)
Fuel transfer pumpRecommended Actions
Fuel Level
Visually inspect the fuel level in the fuel tank. Ensure that the fuel tank contains enough fuel in order to operate the engine.Fuel Tank Cap
Remove the fuel tank cap from the fuel tank. Check the vent port that is in the cap for debris. Clear any restrictions with compressed air.Note: Do not allow debris to enter the fuel tank while you clean the cap. Damage to the fuel system will occur.Diagnostic Codes and Event Codes
Connect Cat ET to the service tool connector. Check for active diagnostic codes and event codes.Look for active diagnostic codes that are related to the low pressure fuel system. Use the appropriate circuit test to troubleshoot any active codes before continuing.Fuel Pressure Sensors
Start the engine. Run the engine at low idle. Use Cat ET to monitor the fuel pressure for the engine.Check the value of the parameter while the engine is at low idle. Ensure that the value of the parameter is reasonable.Increase the engine speed while you monitor the parameter. Ensure that the value of the parameter increase with engine speed. Ensure that the value of the sensor remains reasonable as the pressure is increased.If a problem with the sensor is suspected, replace the suspect sensor.Fuel Pressure Regulating Valve
A fuel pressure regulating valve that is stuck in the open position may cause low fuel pressure. If a problem with the valve is suspected, the problem is probably caused by contamination or debris lodged between the valve and the valve seat. Remove the valve assembly from the fuel filter base. Inspect the valve assembly for contamination or debris. Clean any contamination or debris that may keep the regulating valve open. If debris is present, find the source of the contamination.If the fuel pressure regulating valve is the suspected cause of the low fuel pressure, replace the valve assembly.Fuel Priming Pump (If Equipped)
The electric fuel priming pump is used to prime the low pressure fuel system. Ensure that the electric fuel priming