All pumps or any other mechanical measuring devices, used for retailing or dispensing gasoline shall be securely locked so that no liquid may be drawn therefrom except when the operation of the pumps or other devices is under the supervision and in charge of an attendant.  The Mayor and Council of the municipality hereby determine and declare this section to be necessary for the immediate preservation of the public peace, health, and safety.  Nothing herein shall be construed to prevent or prohibit the use of self-service gas pumps, if such is the intention of the owner.
(1972 Code, § 6-334)