KKK-B-1579B
more than one tank is furnished on diesel engine driven vehicles, means shall be provided to
assure equalized fuel level between the tanks feeding the chassis engine. 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
each tank with single fuel gage. A photoetched, corrosion-resistant plate, permanently protected
decal or stencil, marked to denote the type of fuel to be used, shall be located in a conspicuous
place near the filler cap(s). When an air conditioning system is specified (see 3.5.13), the air
conditioner auxiliary engine shall operate from the same type fuel as the chassis engine; and may
operate from the main chassis fuel tank(s) or from a separate tank specified in 3.4.3.2.1. When
specified (see 6.2), when the air conditioner engine operates from the main engine fuel tank(s),
means shall be provided to assure the auxiliary engine does not draw below 20 percent of the
chassis fuel tank capacity.
Table III Fuel Tank Capacity
Fuel Tank(s) Capacity (gallons)
Vehicle Type
w/out air conditioning
w/ air conditioning
I, II, VI and VII
30
50
III, IV, and V
60
80
*
3.4.3.2.1 Air conditioner auxiliary engine fuel tank. When an air conditioning system is
specified (see 3.5.13), and a separate fuel tank to supply the air conditioner auxiliary engine is
furnished, the auxiliary fuel tank shall have a capacity of not less than 20 gallons and shall be
located under the floor. The auxiliary tank shall be a safety fuel tank of welded seam
construction. The tank shall be provided with a fuel level sensor, connected to the single
(main engine) fuel gage through a selector switch or to two separate fuel gages visable to the
driver. Gage(s) shall be identified. A drain shall be provided in a fuel tank sump, located to
avoid drainage of fuel on any part of the vehicle. A fuel tank filler neck shall be located on the
side of the bus with access through a flush type door. Filler opening shall be identified as
specified in 3.4.3.2. A shut off valve shall be provided in the fuel line adjacent to the tank. The
fuel system shall conform to Federal Motor Carrier Safety Regulations 393.65 and 393.67.
*
3.4.4 Exhaust system. Exhaust system shall conform to Federal Motor Carrier Safety
Regulation 393.83. Exhaust tailpipe shall extend to rear bumper and shall be so located as to
minimize the possibility of exhaust fumes entering the body. For gasoline engine driven
vehicles, the exhaust system beyond the engine compartment shall be insulated from the fuel
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