CONTROL AR-QUICK COUPLER 4825121 - Caterpillar

Illustration 6 g03750256
Transfer Pump Inlet Regulator (TPIR) components
(1) Transfer Pump Inlet Regulator (TPIR)
(2) TPIR return port
Illustration 7 g02355128
Minimum TPIR flow rate in a 12 VDC system
Illustration 8 g02355130
Minimum TPIR flow rate in a 24 VDC system
Table 5
Troubleshooting Test Steps Values Results
10. Transfer Pump Inlet Regulator (TPIR) Flow Test
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 to reactivate the pump.
Refer to Illustration 6.
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. Refer to Illustration 7 or 8 for the minimum acceptable flow rate.
G. 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 12.
Result: The fuel flow is less than the minimum limit.
Proceed to Test Step 11.
11. Transfer Pump Inlet Regulator (TPIR) Return Test
A. Make sure that the TPIR return line is not blocked or kinked.
B. Check that the Electric Fuel Lift Pump (EFLP) is operating correctly.
TPIR return line
Result: The TPIR return line is blocked or kinked.
Repair: Clear the TPIR return line or replace the line
Confirm that the fault is eliminated.
Result: The EFLP is not operating correctly.
Repair: Refer to Troubleshooting, "Relay - Test".
Result: The TPIR return line and the EFLP are OK.
Proceed to Test Step 12.
Illustration 9 g02527498
Minimum EFLP flow rate in a 12 VDC system
Illustration 10 g02527518
Minimum EFLP flow rate in a 24 VDC system
Table 6
Troubleshooting Test Steps Values Results
12. EFLP Flow Test at the Primary Fuel Filter Inlet
A. Make sure the keyswitch is in the OFF position.
B. Disconnect the fuel inlet connection from the primary fuel filter head.
C. Install a suitable blank on the fuel inlet port on the primary fuel filter head.
D. Place the open end of the fuel inlet line in a suitable calibrated container.
E. With the keyswitch in the ON position, measure the input voltage at the EFLP. Record the result.
F. With the keyswitch in the ON position, measure the flow from the fuel inlet line. Record the result.
G. Check the recorded voltage and fuel flow on the graph in Illustration 9 or 10.
EFLP flow
Result: The fuel flow is below the minimum value for the recorded voltage.
Repair: Replace the EFLP. Refer to Disassembly and Assembly, "Fuel Priming Pump - Remove and Install".
Result: The fuel flow is above the minimum value for the recorded voltage.
Proceed to Test Step 13.
13. Check the