GOVERNOR AND FUEL INJECTION PUMP GROUP 6N5474 - Caterpillar

ALIGN="CENTER">Results    
6. Transfer Pump Inlet Regulator (TPIR) Flow Test
Refer to Illustration 1.
A. 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.
B. Connect a temporary drain line to the drain port on the TPIR.
C. Place the end of the temporary drain line into a suitable calibrated container.
D. With the isolator switch in the ON position but the engine not running, use a suitable multimeter to measure the input voltage to the EFLP. Record the reading.
E. With the isolator switch in the ON position but the engine not running, measure the fuel flow from the temporary drain line.
F. For a 12 VDC system, refer to Illustration 2 for the minimum acceptable flow rate.
G. For a 24 VDC system, refer to Illustration 3 for the minimum acceptable flow rate.
H. Remove the temporary drain line from the drain port on the TPIR. Connect the TPIR return line to the TPIR.
   
TPIR flow rate
   
Result: The fuel flow is greater than the minimum limit.
Proceed to Test Step 9.
Result: The fuel flow is less than the minimum limit.
Proceed to Test Step 7.
   
Illustration 4 g02527498
Minimum EFLP flow rate for a 12 VDC system
Illustration 5 g02527518
Minimum EFLP flow rate for a 24 VDC system
Table 3
Troubleshooting Test Steps    Values    Results    
7. Return Pressure Relief Valve Test
A. Disconnect the return line from the secondary fuel filter base and install a blank on the line. Install a temporary line and a calibrated container to the filter base.
B. With the isolator switch in the ON position, measure fuel flow from the temporary line.
C. If the fuel flow is more than
300 mL/min (10.2 oz/min), replace the secondary fuel filter base. Refer to Disassembly and Assembly, "Fuel Filter Base - Remove and Install (Twin Secondary Fuel Filter)".
D. Remove the temporary line and reconnect the return line.
E. If the secondary fuel filter base has been replaced, attempt to start the engine. If the engine does not start, use the following procedure to check the fuel flow from the EFLP:
F. Disconnect the fuel inlet from the primary fuel filter. Place the open end of the disconnected line into a calibrated container.
G. With the isolator switch in the ON position, measure the flow from the fuel line. Refer to the Illustration 4 for the minimum acceptable fuel flow on a 12 VDC system. Refer to the Illustration 5 for the minimum acceptable fuel flow on a 24 VDC system.
   
PRV test
   
Result: The fuel flow is more than 5% below the acceptable limit.
Replace the EFLP.
Result: The fuel flow is more than 5% above the acceptable limit.
Contact the Technical Communicator at a Cat dealer.
Result: The fuel flow is within the acceptable limit.
Proceed to Test Step 8.
   
8. Check the Return Fuel Lines
A. Make sure that the TPIR return line is not blocked or kinked..
B. If the TPIR return line is clear, confirm that the Electric Fuel Lift Pump (EFLP) is operating. Make sure that fuel lines