KIT-SEAL 4812715 - Caterpillar

Illustration 3 g02527518
Minimum EFLP flow rate
If the fuel flow is more than 5% below the acceptable limit, replace the EFLP.
If the fuel flow is more than 5% above the acceptable limit, contact the Technical Communicator at a Caterpillar dealer.
If the fuel flow from the EFLP is within limits, proceed to "Check the Return Fuel Lines".Check the Return Fuel Lines
Make sure that the TPIR return line is not blocked or kinked.
If the TPIR return line is clear, confirm that the Electric Fuel Lift Pump (EFLP) is operating. Make sure that fuel lines between the EFLP and the TPIR are not blocked or kinked.
If the fuel lines to the TPIR are clear and the EFLP is operating, replace the TPIR.
If the fault is still present, contact the Technical Communicator at a Caterpillar dealer.Low Fuel Rail Pressure
Make sure that the level of fuel in the fuel tank is sufficient. If necessary, fill the fuel tank.
Inspect the high-pressure fuel system for leaks. Rectify any fuel leaks.
Use the electronic service tool to perform the "High Pressure Fuel Pump Calibration".
Check that the Electric Fuel Lift Pump (EFLP) is operating. If the EFLP is suspect, refer to Troubleshooting, "Fuel Pump Relay Circuit - Test".
Check for the introduction of air in the low-pressure fuel system. Refer to Systems Operation, Testing, and Adjusting, "Air in Fuel - Test". If necessary, rectify the cause of air in the fuel.
Use the electronic service tool in order to perform the "Fuel Rail Pressure Relief Valve Test". This test will identify excessive leakage through the Pressure Limiting Valve (PLV) in the fuel rail. If excessive leakage is identified, replace the fuel rail. Refer to Disassembly and Assembly, "Fuel Manifold (Rail) - Remove and Install". If the fault is still present, continue with this procedure.
Turn the keyswitch to the OFF position and then disconnect the electrical connector from the EFLP.
With the keyswitch in the ON position, measure the voltage at the harness connector for the EFLP. The voltage must be between 20 VDC and 28 VDC. If the voltage is below 20 VDC, investigate the cause. Refer to Troubleshooting, "Fuel Pump Relay Circuit - Test".
Turn the keyswitch to the OFF position and then reconnect the electrical connector to the EFLP.
If a repair has been performed to rectify a low supply voltage to the EFLP, attempt to start the engine. If the engine does not start, continue with this procedure.Note: Before performing the following fuel system tests, the engine must be stopped for a minimum of 30 minutes.Note: When performing the following fuel system tests, the Electric Fuel Lift Pump (EFLP) will only operate for 2 minutes unless the engine is running. If necessary, cycle the keyswitch in order to reactivate the pump.
Illustration 4 g02901337
Locations on the low-pressure fuel system (1) Transfer pump inlet regulator (TPIR) (2) Transfer pump inlet regulator return port (3) Fuel return to the secondary fuel filter (4) Secondary fuel filter baseTransfer Pump Inlet Regulator (TPIR) Flow Test
Refer to Illustration 4.Perform the following procedure:
Disconnect the TPIR return line from the drain