54 Fuel System
Fuel Pour Point
Fuel pour point should be at least 10
F
(6
C) lower than the lowest ambient tem-
perature at which the engine must start and
operate. Lower pour points of diesel fuel
grade No. 1–D may be necessary in ex-
tremely cold weather.
Fuel Cloud Point
The cloud point should be below the lowest
ambient temperature at which the engine
must start and operate, to prevent the fuel
filter elements from plugging with wax
crystals.
Fuel Viscosity
Fuel viscosity must be kept above 1.4 cSt
at 100
F (38
C) to provide adequate fuel
system lubrication. The viscosity also has
an effect on the atomization of the fuel
when it is injected into the cylinders.
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