[Code of Federal Regulations]

[Title 49, Volume 5]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR393.83]



[Page 425-426]

 

                        TITLE 49--TRANSPORTATION

 

        CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION,

                      DEPARTMENT OF TRANSPORTATION

 

PART 393_PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of Contents

 

              Subpart G_Miscellaneous Parts and Accessories

 

Sec.  393.83  Exhaust systems.



    (a) Every motor vehicle having a device (other than as part of its 

cargo) capable of expelling harmful combustion fumes shall have a system 

to direct the discharge of such fumes. No part shall be located where 

its location would likely result in burning, charring, or damaging the 

electrical wiring, the fuel supply, or any combustible part of the motor 

vehicle.

    (b) No exhaust system shall discharge to the atmosphere at a 

location immediately below the fuel tank or the fuel tank filler pipe.

    (c) The exhaust system of a bus powered by a gasoline engine shall 

discharge to the atmosphere at or within 6 inches forward of the 

rearmost part of the bus.

    (d) The exhaust system of a bus using fuels other than gasoline 

shall discharge to the atmosphere either:

    (1) At or within 15 inches forward of the rearmost part of the 

vehicle; or

    (2) To the rear of all doors or windows designed to be open, except 

windows designed to be opened solely as emergency exits.

    (e) The exhaust system of every truck and truck tractor shall 

discharge to the atmosphere at a location to the rear of the cab or, if 

the exhaust projects above the cab, at a location near the rear of the 

cab.

    (f) No part of the exhaust system shall be temporarily repaired with 

wrap or patches.



[[Page 426]]



    (g) No part of the exhaust system shall leak or discharge at a point 

forward of or directly below the driver/sleeper compartment. The exhaust 

outlet may discharge above the cab/sleeper roofline.

    (h) The exhaust system must be securely fastened to the vehicle.

    (i) Exhaust systems may use hangers which permit required movement 

due to expansion and contraction caused by heat of the exhaust and 

relative motion between engine and chassis of a vehicle.



[53 FR 49401, Dec. 7, 1988]