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|  MIL-T-2452J
3.4.2.6 Radio interference suppression. The vehicle shall be suppressed to limit
electromagnetic radiation in accordance with SAE J551. Any body equipment emitting
electromagnetic radiation shall be suppressed to the same level as the vehicle chassis.
3.4.3 Fuel system. The fuel system shall conform to Federal Motor Carrier Safety
Regulations 393.65 and 393.67.
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3.4.3.1 Air cleaner. An air cleaner shall be furnished.
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3.4.3.2 Fuel tank(s). Fuel tank total capacity shall be not less than 30 gallons for class A
vehicles and not less than 50 gallons (43 gallons for vehicles destined for California) for all other
vehicle classes. When more than one tank is furnished on diesel engine driven vehicles, means
shall be provided to assure an equalized fuel level in both tanks. When more than one tank is
furnished on gasoline engine driven vehicles, a selector valve connecting either tank to the
engine fuel intake shall be provided and means shall be provided to monitor the fuel level of
either tank from a single fuel gage.
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3.4.3.3 Fuel and water separator. When specified (see 6.2), in addition to the
manufacturer's standard fuel filter(s), a fuel and water separator shall be furnished for diesel
engine vehicles. The separator shall include a water coalescer and a drain valve.
3.4.4 Exhaust system. The exhaust system shall conform to Federal Motor Carrier
Regulation 393.83. Vertical exhaust systems, if furnished and if capable of being reached easily
by personnel entering or leaving either side of the cab, shall be provided with a heat shield.
Vertical exhaust systems shall be provided with a hinged rain cap. When specified (see 6.2),
naturally aspired engines shall be furnished with a spark arrester with an efficiency rating of not
less than 80 percent when tested in accordance with SAE J350.
3.4.4.1 Exhaust system safety shield. The exhaust system or the hydraulic system shall
be shielded so that, in the event of a hydraulic line rupture or hydraulic fluid leak, the hydraulic
fluid will not come into contact with any part of the vehicle exhaust system.
3.4.5 Automatic or semiautomatic transmission. The vehicle shall be provided with an
automatic or semiautomatic transmission. The input torque capacity of the transmission shall be
at least equal to the maximum torque delivered by the engine. The transmission shall include a
hydraulic torque converter and not less than five forward gear ratios or, for class A only, four
forward speeds and a two-speed rear axle. Normal driving range selector position shall provide
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