KIT-SEAL 5233146 - Caterpillar

Transfer Pump Inlet Regulator (TPIR) Flow TestRefer to Illustration 1.
Disconnect the TPIR return line from the drain port on the TPIR. Install a suitable blanking cap on the open port in the TPIR return line
Connect a temporary drain line to the drain port on the TPIR.
Place the end of the temporary drain line into a suitable calibrated container.
With the keyswitch in the ON position but the engine not running, use a suitable multimeter to measure the input voltage to the EFLP. Record the reading.
With the keyswitch in the ON position but the engine not running, measure the fuel flow from the temporary drain line. Refer to Illustration 2 for the minimum acceptable flow rate.
Illustration 2 g02355130
Minimum TPIR flow rate
Remove the temporary drain line from the drain port on the TPIR. Connect the TPIR return line to the TPIR.
If the fuel flow in Step 5 is greater than the minimum limit, contact the Technical Communicator at a Cat dealer.
If the fuel flow in Step 5 is below the minimum limit or there is no fuel flow, replace the EFLP.Transfer Pump Inlet Regulator (TPIR) Return TestIn order to check the return flow from the TPIR, perform the following procedure:
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 the 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 Cat 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".
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