PLATE & FILM GP 4513929 - Caterpillar

Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death.
Contact with high-pressure fuel may cause personal injury or death. Wait 10 minutes after the engine has stopped to allow fuel pressure to purge before any service or repair is performed on the engine fuel lines.
If the high-pressure fuel lines have a leak, the high-pressure fuel lines must be replaced. Refer to Disassembly and Assembly, "Fuel injection lines - Remove" and Disassembly and Assembly, "Fuel injection lines - 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 10 VDC and 14 VDC. If the voltage is below 10 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 run 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 1 g02790939
Location of the Transfer pump inlet regulator (TPIR) (1) Fuel return to the secondary fuel filter (2) Secondary fuel filter base (3) Transfer pump inlet regulator (TPIR) (4) Transfer pump inlet regulator return portTransfer Pump Inlet Regulator (TPIR) Flow Test
Perform the following procedure:
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 g02485896
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, proceed to "Intake Manifold Pressure".
If the fuel flow in Step 5 is below the minimum limit, proceed to "Return Pressure Relief Valve Test".Return Pressure Relief Valve Test
Use the following procedure to check the fuel flow through the return pressure relief valve in the secondary fuel filter base:
Disconnect the return line (1) from the secondary fuel