TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Specifications
Section E - Engine Identification
Page E-7
4B Fuel System Data (nonautomotive)
Distributor-Type Fuel Injection
4B3.9
4BT3.9
4BTA3.9
Pumps
Maximum Allowable Restriction
to the Fuel Transfer Pump Must
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
Not Exceed
Maximum Allowable Return Line
518 mm Hg [20.4 in Hg] 518 mm Hg [20.4 in Hg]
518 mm Hg [20.4 in Hg]
Restriction
Maximum Allowable Pressure
35 kPa [5 psi]
35 kPa [5 psi]
35 kPa [5 psi]
Drop across Fuel Filter
Maximum Inlet Pressure to the
70 kPa [10 psi]
70 kPa [10 psi]
70 kPa [10 psi]
Injection Pump Must Not Exceed
In-Line-Type Fuel Injection
Pumps
Maximum Inlet Restriction to the
Fuel Transfer Pump Must Not
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
Exceed
Fuel Transfer Pump Minimum
172 kPa [25 psi] High
172 kPa [25 psi] High
172 kPa [25 psi] High
Output Pressure
Flow and 90 kPa [13 psi] Flow and 90 kPa [13 psi]
Flow and 90 kPa [13 psi]
Low Flow @ Rated rpm
Low Flow @ Rated rpm
Low Flow @ Rated rpm
Fuel Filter Restriction (maximum
35 kPa [5 psi]
35 kPa [5 psi]
35 kPa [5 psi]
pressure drop across filters)
Fuel Pump Gallery Pressure
* 140 kPa [20 psi] @
* 140 kPa [20 psi] @
* 140 kPa [20 psi] @
Rated rpm
Rated rpm
Rated rpm
Fuel Return Maximum Restriction 518 mm Hg [20.4 in Hg] 518 mm Hg [20.4 in Hg]
518 mm Hg [20.4 in Hg]
* The low-flow fuel transfer pump will have 82.7 kPa [12 psi].
6B Fuel System Data (nonautomotive)
Distributor-Type of Fuel Injec-
6B5.9
6BT5.9
6BTA5.9
tion Pumps
Maximum Allowable Restriction
to the Fuel Transfer Pump Must
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
Not Exceed
Maximum Allowable Return Line
518 mm Hg [20.4 in Hg] 518 mm Hg [20.4 in Hg]
518 mm Hg [20.4 in Hg]
Restriction
Maximum Allowable Pressure
35 kPa [5 psi]
35 kPa [5 psi]
35 kPa [5 psi]
Drop across Fuel Filter
Maximum Inlet Pressure to the
70 kPa [10 psi]
70 kPa [10 psi]
70 kPa [10 psi]
Injection Pump Must Not Exceed
In-Line-Type Fuel of Injection
Pumps
Maximum Inlet Restriction to the
Fuel Transfer Pump Must Not
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
100 mm Hg [4 in Hg]
Exceed
Fuel Transfer Pump Minimum
172 kPa [25 psi] High
172 kPa [25 psi] High
172 kPa [25 psi] High
Output Pressure
Flow and 90 kPa [13 psi] Flow and 90 kPa [13 psi]
Flow and 90 kPa [13 psi]
Low Flow @ Rated rpm
Low Flow @ Rated rpm
Low Flow @ Rated rpm
Fuel Filter Restriction (maximum
35 kPa [5 psi]
35 kPa [5 psi]
35 kPa [5 psi]
pressure drop across filters)
Fuel Pump Gallery Pressure
* 140 kPa [20 psi] @
* 140 kPa [20 psi] @
* 140 kPa [20 psi] @
Rated rpm
Rated rpm
Rated rpm
Fuel Return Maximum Restriction 518 mm Hg [20.4 in Hg] 518 mm Hg [20.4 in Hg]
518 mm Hg [20.4 in Hg]
* The low-flow fuel transfer pump will have 82.7 kPa [12 psi].
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