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|  MIL-T-62518A
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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.
*
(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 3.4.1.8(c) and (d) may be combined.
* 3.4.1.9 Vernier throttle control. When specified (see 6.2), a manual vernier 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 (diesel engines). 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 355 milliliters (mL) (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 circuit breaker that will protect the
motor from overcrank heat damage. The circuit breaker shall not limit cranking ability for a
startable engine.
* 3.4.2.2 Ignition system (gasoline engines). For gasoline engine driven vehicles, a 12-volt dc
ignition system shall be furnished.
* 3.4.2.3 Alternator. Unless otherwise specified (see 6.2), a minimum 85-ampere alternator
shall be furnished. The alternator output with the engine at engine idle speed shall be not less
than 40 amperes.
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