TM 5-2420-230-24-2
Fuel Lift Pump (005-045)
B3.9 and B5.9 Series Engines
Page 5-82
Section 5 - Fuel System - Group 05
Use the chart in the illustration to find the correct flow
volume specification for Cummins Part No. 3917334, fuel
transfer pump, used with the Bosch P7100 in-line injection
pump.
Draw a straight vertical line above the measured
cranking rpm
Draw a straight horizontal line from the measured
flow volume to the engine cranking rpm vertical line
to find the intersection point
Any intersection point above the required flow line
indicates an acceptable flow
Any intersection point below the required flow line
indicates unacceptable flow and a defective pump
or too much line restriction.
For example, if cranking speed of the engine is 240 rpm at
a flow volume of 390 ml [13.2 oz], this would indicate a good
pump.
For example, if cranking speed of the engine is 290 rpm at
a flow volume of 360 ml [12.2 oz], this would indicate a bad
pump.
Fuel Transfer Pump Flow Volume (Federal Mogul-Carter)
Use the chart in the illustration to find the correct flow
volume specification for Cummins Part No. 3930349,
3932228, 3933256, 3936320 fuel transfer pumps, and su-
perseding Cummins part numbers.
Draw a straight vertical line above the measured
cranking rpm
Draw a straight horizontal line from the measured
flow volume to the engine cranking rpm vertical line
to find the intersection point
Any intersection point above the required flow line
indicates an acceptable flow
Any intersection point below the required flow line
indicates unacceptable flow and a defective pump
or too much line restriction.
The maximum inlet restriction to the lift pump is 100
mm Hg [4 in Hg].
L-942
