C15 On-Highway Engine Caterpillar

Illustration 1	g01101530
Right side view (1) Inlet port (2) Pressure regulating valve

Illustration 2	g01101531
Left side view (3) Weep hole (4) Outlet port

Illustration 3	g01101532
Typical cover that is on the rear of the front housing for the fuel transfer pump

(5) Torque for two bolts ... 30 ± 5 N·m (22 ± 4 lb ft)

When the pump is viewed from the drive end the rotation of the pump is clockwise.

When the fuel transfer pump group is using diesel fuel, the fuel transfer pump group has the following specifications:

1. Run the pump at 2940 rpm. The full bypass pressure must be 2100 to 2170 kPa (305 to 315 psi).

2. Run the pump at 840 rpm. The flow at 550 kPa (80 psi) must be 3.0 L/min (0.8 US gpm) minimum.

3. Run the pump at 2940 rpm. The flow at 1930 kPa (280 psi) must be 7.0 L/min (1.85 US gpm) minimum.

4. Run the pump at 120 rpm. Keep the inlet open to the atmosphere for 10 seconds. Block the inlet. The pump must maintain the vacuum of 30 kPa (4.5 psi) minimum in 30 seconds.

5. Run the pump at 840 rpm. Keep the inlet open to the atmosphere for 10 seconds. Block the inlet. The pump must maintain the vacuum of 45 kPa (6.5 psi) minimum in 30 seconds.

6. Run the pump at 120 rpm with a blocked inlet for 30 seconds. The pump inlet must have a suction lift of 60.9 kPa (9.0 psi)within 30 seconds.