84141M Mariner DIAPHRAGM

Table 1
Event Code
CDL Code Code Description Comments
E198(1) Low Fuel Pressure The code is logged.
The ECM will illuminate the action lamp.
E198(2) Probable Causes
Fuel
Fuel tank
Fuel filters
Pressure relief valve for the fuel transfer pump
Fuel pressure sensor
Fuel pressure regulator
Return check valve
Fuel linesRecommended 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 active E198 is present.
Proceed to Test Step 2.
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
2. Check the Fuel Level in the Tank
A. 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.
B. Visually inspect the fuel level in the fuel tank. Ensure that the fuel tank contains enough fuel in order to operate the engine.
C. 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.
Repair: 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.
Note: Cold weather adversely affects the characteristics of the fuel. Refer to the engines Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold-weather operation.
Leaks
Result: No leaks were found.
Proceed to Test Step 4.
Result: Leaks were found in the fuel system.
Repair: Repair the leaks. Verify that the problem is resolved.
If the problem is not resolved, proceed to Test Step 4.
Table 3
Required Tooling
Quantity Part Number
1 8T-7860 Connector
1 110-6349 Fitting As
1 8T-0855 Pressure Gauge
1 6V-3990 Coupler
Illustration 1 g02051497
Secondary fuel filter mounting
(1) Fuel temperature sensor
(2) Fuel filter differential pressure sensor
(3) Fuel pressure sensor (filtered fuel pressure)
Table 4
Engine RPM Fuel Pressure from Cat ET Fuel Pressure from the Mechanical Gauge
700
1850
Table 5
Troubleshooting Test Steps Values Results
4. Compare the Status of Fuel Pressure in Cat ET to a Mechanical Gauge
Note: Do not use the sampling port for measuring the fuel pressure.
A. Remove fuel pressure sensor (3).
B. Install a 8T-7860 Connector into the port of the pressure sensor (3).
C. Install the 110-6349 Fitting As onto the 8T-7860 Connector.
D. Install a 8T-0855 Pressure Gauge onto a 6V-3990 Coupler.
E. Install the 6V-3990 Coupler onto the 110-6349 Fitting As.
F. Record the fuel pressure on the pressure gauge. Record the data in Table 4.
137 kPa (20 psi)
Results: The fuel pressure readings are comparable.
Proceed to Test Step 5.
Results:
The value of the fuel pressure is not within 137 kPa (20 psi) of the fuel pressure reading that is 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 5.
Table 6
Engine RPM Minimum Acceptable Fuel Pressure
700 500 kPa (73 psi)
1850 650 kPa (94 psi)
Table 7
Troubleshooting Test Steps Values Results
5. Verify that the Fuel Pressure is Within Specifications
A. Verify that the recorded fuel pressure is above the minimum acceptable fuel specifications. Refer to Table 6 for the minimum acceptable specifications.
Fuel Pressure
Result: The fuel pressure is above the minimum acceptable pressure specifications.
Proceed to Test Step 7.
Result: The fuel pressure is not above the minimum acceptable pressure specifications.
Proceed to Test Step 6.
6. Replace the Fuel Filters
A. Replace the primary filter, the secondary filter, and the tertiary fuel filters.
Note: The fuel system will need to be primed after the filters are replaced.
B. Verify that the fuel pressure is above the minimum acceptable pressure specifications. Refer to Table 6 for proper specifications.
Fuel Pressure
Result: The f