TM 5-2420-230-24-2
Fuel Recommendations and Specifications
B3.9 and B5.9 Series Engines
Page 5-8
Section 5 - Fuel System - Group 05
Fuel Recommendations and Specifications
Fuel Recommendations
WARNING
Do not mix gasoline, alcohol, or gasohol with diesel fuel. This mixture can cause an explosion.
CAUTION
Due to the precise tolerances of diesel injection systems, it is extremely important that the fuel be kept clean
and free of dirt or water. Dirt or water in the system can cause severe damage to both the fuel pump and the
fuel injectors.
Cummins Engine Company, Inc. recommends the use of ASTM No. 2D fuel. The use of No. 2 diesel fuel will result
in optimum engine performance.
At operating temperatures below 0C [32F], acceptable performance can be obtained by using blends of No. 2D and
No. 1D.
NOTE: Lighter fuels can reduce fuel economy or possibly damage the fuel injection pump.
The viscosity of the fuel must be kept above 1.3 cSt at 40C [104F] to provide adequate fuel system lubrication.
The following chart lists acceptable alternate fuels for B Series engines.
Acceptable Substitute Fuels - Cummins B Fuel System
No. 1D
No. 2D
No. 1K
Jet-A
Jet-A1
JP-5
JP-8
Jet-B
JP-4
CITE
Diesel(1) (2)
Diesel(3)
Kerosene
A
OK
A
A
A
A
A
NOT OK
NOT OK
NOTOK
1. An ``A'' means OK only if fuel lubricity is adequate. This means the BOCLE number is 3100 or greater as measured with the US Army
scuffing BOCLE test.
2. Any adjustment to compensate for reduced performance with a fuel system using alternate fuel is not warrantable.
3. Winter blend fuels, such as found at commercial fuel dispensing outlets, are combinations of No. 1D and No. 2D diesel fuel, and are
acceptable.
Additional information for fuel recommendations and specifications can be found in Fuel for Cummins Engines, Bulletin
No. 3379001. See ordering information in the back of this manual.
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