TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Fuel Lift Pump (005-045)
Section 5 - Fuel System - Group 05
Page 5-81
AC Rochester
Fuel Transfer Pump Flow Volume
Use the chart in the illustration to find the correct flow
volume specification for Cummins Part No. 3918076, fuel
transfer 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 280 ml [9.5 oz], this would indicate a good
pump.
For example, if cranking speed of the engine is 280 rpm at
a flow volume of 260 ml [8.8 oz], this would indicate a bad
pump.
Use the chart in the illustration to find the correct flow
volume specification for Cummins Part No. 3918000, fuel
transfer pump, used on the 300-hp B Series marine engine.
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 260 ml [8.8 oz], this would indicate a good
pump.
For example, if cranking speed of the engine is 280 rpm at
a flow volume of 235 ml [7.9 oz], this would indicate a bad
pump.
L-941
