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|  MIL-T-62491C
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(c) An in-line fuel warmer or preheater unit shall be provided on diesel engine driven vehicles
to prevent clogging of fuel filters due to wax crystallization in the fuel. The unit shall use
engine coolant to transfer sufficient heat to the diesel fuel to heat it from an inlet
temperature of -40C (-40F) to an outlet temperature of -13C (+9F), with a fuel 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. The unit shall
not cause heating of the fuel above 27C (80F) under any possible condition.
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(d) An in-tank fuel warmer or preheater unit shall be provided on diesel engine driven
vehicles. The unit shall use engine coolant to transfer heat to the fuel in one fuel tank.
The warmer shall not cause heating of any fuel above 27C (80F) under any possible
condition, shall not disable or cause elimination of the fuel gage sending unit and shall not
violate 3.2.1 or any Federal Motor Carrier Safety Regulation. A coolant shut off valve
shall be included. The units required by 3.4.1.9(c) and (d) may be combined.
* 3.4.1.10 Fuel fired engine preheater. When specified (see 6.2), a diesel fuel fired engine
water 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 to the engine coolant system.
The heater shall be capable of starting and operating at -51C (-60F) and shall heat the engine to
+4C (+40F) from -51C (-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. The system shall include fuel
warmers or preheaters conforming to 3.4.1.9(c) and (d).
* 3.4.1.11 Vernier throttle control. When specified (see 6.2), a manual vernier controlled
throttle with quick release shall be furnished, except on electronically controlled engines.
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. For diesel engine driven vehicles, a 12- or 24-volt direct current (dc)
starting system, with a 12-volt dc lighting system shall be furnished. Engine starting equipment
shall include an ether starting system, glow plug or grid heater. If an ether system is furnished in
lieu of a glow plug or grid heater, 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 ether reservoir of not
less than 12 fluid ounces shall be furnished. A reservoir need not be furnished. When specified
(see 6.2), the starting motor shall be equipped with a thermostat controlled, automatic resetting
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