SEAT GP 3013165 - Caterpillar

Table 5
Required Tooling for Pressure Sensor (3)
5P-1318 Adapter
123-0783 Fluid Sampling Valve Gp
8T-0855 Pressure Gauge
6V-3990 Coupler
Table 6
Worksheet
Engine RPM Unfiltered fuel pressure from Cat ET Fuel pressure from the mechanical gauge
800 - -
1800 - -
Illustration 3 g03812246
Simplex Fuel Supply Lines
Illustration 4 g03812355
Duplex Fuel Filters and Supply Lines Front View (If Equipped)
Illustration 5 g03812369
Duplex Fuel Filters and Supply Lines Rear View (If Equipped)
Illustration 6 g03812185
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 cooler, if equipped. Inspect the fuel return line from the head to the fuel tank. Inspect the lines for restrictions, pinching, and swelling. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect" for additional information.
Inspect Lines
Result: The fuel lines and the cooler (if equipped) are OK.
Proceed to Test Step 4.
Result: The fuel lines and the cooler (if equipped) are not OK.
Repair: Make the necessary repairs. Verify that the problem has been resolved.
If the problem is not resolved, proceed to Test Step 4.
Illustration 7 g06127180
(8) Return Fuel Pressure Regulator
Table 8
Troubleshooting Test Steps Values Results
4. Replace the Return Fuel Pressure Regulator
Pressure Regulator
Result: The regulator was replaced. Verify that the problem is resolved.
If the problem is not resolved, proceed to Test Step 5.
5. Inspect the Relief Valve for the Fuel Transfer Pump
A. Inspect the relief valve for the transfer pump. The spring must move freely.
Transfer Pump
Result: The relief valve is stuck CLOSED.
Repair: Replace the fuel transfer pump. Verify that the problem has been resolved.
Result: The relief valve is OK.
Repair: Clean the relief valve and reinstall the relief valve. Verify that the problem has been resolved.
If the procedure did not correct the issue, contact your Caterpillar dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).