LINE ASSEM. (NO. 4) 1W9204 - Caterpillar

Use this procedure to troubleshoot a problem with the fuel system. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description CDL Code and Description Comments
1390-15
Engine Fuel Valve #1 Inlet Absolute Pressure : High - least severe (1) E222 (1)
High Gas Supply Pressure The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged.
1390-17
Engine Fuel Valve #1 Inlet Absolute Pressure : Low - least severe (1) E221 (1)
Low Gas Supply Pressure The fuel pressure has exceeded the trip point for the programmed delay time.
The code is logged. Probable Causes
Codes
Sensor
Filter
Fuel system
Gas pressure
Pressure regulatorRecommended Actions
Table 2
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.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Check the Fuel Pressure Sensor
A. Connect Cat ET.
B. Record the fuel pressure from Cat ET.
Use a mechanical gauge to check the system fuel pressure. Refer to Testing and Adjusting, "Fuel Pressure (Gas System)" for additional information.
C. Record the fuel pressure on the pressure gauge.
Note: If a mechanical gauge is not available, determine if the fuel pressure reading on Cat ET is reasonable.
Sensor
Result: The gauge value of the fuel pressure is reasonable when compared to the fuel pressure reading shown in Cat ET.
Proceed to Test Step 3.
Result: The gauge value of the fuel pressure is not reasonable when compared to the fuel pressure reading shown in Cat ET.
Repair: Replace the pressure sensor. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position.
Verify that the repair eliminated the problem.
3. Check the Fuel Filter
A. Measure the fuel filter's differential pressure according to Operation and Maintenance Manual, "Fuel System Fuel Filter Differential Pressure - Check".
Fuel Filter
Result: The fuel filter is OK.
Proceed to Test Step 4.
Result: The fuel filter is NOT OK.
Repair: Replace the filter element.
If the problem is not resolved, proceed to Test Step 4.
Gaseous fuel is present. Personal Injury or Death can result from an open flame or spark igniting the gaseous fuel causing an explosion and/or fire. Always use a gas detector to determine the presence of gaseous fuel when maintaining and servicing. Contact your local gas provider immediately for assistance in the event of a leak.
Table 3
4. Check the Fuel System
A. Obtain a fuel analysis.
Note: If the quality of the gas is inconsistent, obtain several analyses over a period of time.
B. Enter the data into Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)".
C. Verify that the fuel supply pressure is adequate and stable.
D. Verify that the size of the fuel line is sufficient.
E. Inspect the fuel system for leaks.
Note: Always use a gas detector to determine the presence of gaseous fuel. Contact your local provider of gas immediately for assistance.
F. Inspect the following fuel system components:
- Fuel filter
- Gas