3056E Industrial Engine Caterpillar

Illustration 1	g00761195
The fuel priming pump is located on the right hand side of the cylinder block. (1) Fuel priming pump (2) Priming lever (A) Fuel inlet (B) Fuel outlet

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

1. Disconnect the line for the fuel outlet (B).

2. Put a pressure gauge in the fuel outlet (B) of the fuel priming pump (1).

3. Prime the fuel system in order to eliminate air from the fuel priming pump. Refer to Testing and Adjusting, "Fuel System - Prime" for the proper procedure.

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

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

   Maximum pressure ... 35 to 55 kPa (5 to 8 psi)

   Minimum pressure ... 26 kPa (3.8 psi)

6. If the pressure is less than the minimum pressure, the fuel priming pump must be replaced.

7. Observe the rate that the pressure drops. If the pressure drops to one half of the maximum pressure in less than 30 seconds, the fuel priming pump must be replaced.

8. Remove the pressure gauge from the fuel priming pump. Connect the outlet line to the fuel priming pump (1). Prime the fuel system in order to eliminate air from the fuel system. Refer to Testing and Adjusting, "Fuel System - Prime" for the proper procedure.

9. Connect the fuel injection pump solenoid wire.