3054B Engine for Caterpillar Built Machines Caterpillar

The pressure test measures the output pressure of the fuel transfer pump. Low fuel pressure and starting difficulty may be indications of problems with the fuel transfer pump.

1. Put a pressure gauge in the outlet of the fuel transfer pump.

2. Disconnect the fuel injection pump solenoid wire (if equipped). Put the fuel shutoff lever in the fuel shutoff position.

3. Crank the engine for ten seconds. Record the maximum pressure. The pressure indication on the gauge should be in the following ranges:

   Maximum pressure ... 70 kPa (10 psi)

   Minimum pressure ... 30 kPa (4.5 psi)

4. Observe the amount of time for the maximum pressure that was recorded during cranking to decrease by one-half. If the time is less than thirty seconds, the fuel transfer pump must be replaced or repaired.
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   Illustration 1	g00659526
   (1) Strainer (2) Seal (3) Cover

5. If the fuel pressure is less than the minimum pressure, the fuel transfer pump must be repaired or replaced. Refer to the Disassembly and Assembly Module, "Fuel Transfer Pump - Remove" topic for additional information.

   If the fuel pressure is low, remove cover (3) and seal (2). Inspect strainer (1) for debris.

   Clean the cover, the seal, and the strainer with a nonflammable solvent. Carefully wash any debris from the chamber of the pump.

6. Assemble the fuel transfer pump. Ensure that the cover of the fuel transfer pump is secure so that air cannot enter the system.

   Remove the air from the fuel transfer pump. Refer to the Testing and Adjusting section, "Remove Air From The Fuel System" topic in this module.

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   Illustration 2	g00508433
   Inspect the components of the fuel transfer pump. (4) Pivot pin (5) Link arm (6) Rocker lever

7. Measure the fuel pressure again. If the pressure remains low, remove the fuel transfer pump from the engine. Inspect the installation of the pivot pin in the rocker lever and the link arm.

   If pivot pin (4) fits loosely in rocker lever (5) and link arm (6), replace the fuel transfer pump. If the pivot pin, the rocker lever, or the link arm are damaged, replace the fuel transfer pump.

8. Install the fuel transfer pump on the engine. Refer to the Disassembly and Assembly Module, "Fuel Transfer Pump - Install" topic. Clean the threads of the bolts or the studs and nuts. Apply 4C-4030 Thread Lock Compound to the first three threads of the bolts or studs. Refer to the Specifications module, "Fuel Transfer Pump" topic for the torque for tightening the bolts or the nuts and studs.