[Code of Federal Regulations] [Title 49, Volume 5] [Revised as of October 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR397.15] [Page 477] TITLE 49--TRANSPORTATION DEPARTMENT OF TRANSPORTATION PART 397_TRANSPORTATION OF HAZARDOUS MATERIALS; DRIVING AND PARKING RULES--Table of Contents Subpart A_General Sec. 397.15 Fueling. When a motor vehicle which contains hazardous materials is being fueled-- (a) Its engine must not be operating; and (b) A person must be in control of the fueling process at the point where the fuel tank is filled.