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|  MIL-T-14382W
(d)
A fuel warmer or preheater shall be provided on diesel engine driven vehicles to prevent
clogging of fuel filters due to wax crystallization in the fuel. The fuel warmer shall use
engine coolant to transfer sufficient heat to the diesel fuel to heat it from an inlet
temperature of minus 40F to an outlet temperature of plus 9F, with a flow rate not less
than the maximum fuel demand of the engine fuel system. A coolant shutoff valve shall
be provided for the coolant inlet side of the fuel warmer unit.
3.4.1.8 Fuel fired engine preheater. When specified (see 6.2), for diesel engine driven
vehicles, a diesel fuel fired engine coolant heater shall be furnished to preheat the engine. The
heater shall include a timer, a thermostat and a circulating pump and shall be connected directly
across the engine coolant inlet and outlet. The heater shall be capable of starting and operating at
minus 60F and shall heat the engine to plus 40F from minus 60F in not more than 1 hour. The
system shall be equipped with a light, visible to the driver, to indicate that the preheater is
operating.
3.4.2 Electrical system. The electrical system shall be in accordance with Federal Motor
Carrier Safety Regulations 393.27 through 393.31 and 393.33.
3.4.2.1 Starting system (diesel engine). For diesel engine driven vehicles, a 12 or 24-volt
direct current (dc starting system, with a 12-volc dc lighting system, shall be furnished. Unless
otherwise specified (see 6.2), a minimum 90-ampere alternator shall be furnished which provides
a dc output capacity, at normal engine idle speed, adequate to support all electrical loads
operating simultaneously, except the winch. Engine starting equipment shall include au ether
starting system or a glow plug. If an ether system is furnished in lieu of a glow plug, it shall be
of the measured shot type. The measured shot type ether system shall be key operated or
manually operated from the driver's compartment, and shall be inoperative with the engine warm.
Complete provisions for a replaceable reservoir of not less than 12 fluid ounces shall be
furnished. A reservoir need not be furnished.
3.4.2.2 Ignition system (gasoline engine). For gasoline engine driven vehicles, a 12-volt dc
system shall be furnished. Unless otherwise specified (see 6.2), an alternator of not less than
60 amperes rated capacity shall be furnished which provides a dc output capacity, at normal
engine idle speed, adequate to support all electrical loads operating simultaneously, except the
winch.
3.4.2.3 Battery. The battery furnished shall be of 12-volt potential. The total reserve
capacity ratings and the total cold cranking ratings at 0F, both measured in accordance with
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