Here's what I found out, about this subject:
International Air Carriers flying to the US, have to comply and are authorized to fly to the US of A, under 14CFR Parts 91 (General Operating and Flight Rules) and 129 (OPERATIONS: Foreign Air Carriers and Foreign Operators of U.S.-Registered Aircraft Engaged in Common Carriage), and 49CFR Part 175 (Carriage by Aircraft).
The DoT issues Ops Specs, that must be signed and accepted by the General Operations Manager of the airline who will be responsible to instruct his pilots, his maintenance and his operations to comply with those Specs.
In resume: The fueling issue that was raised in this thread may be answered via the observation of what is written in Part 129.19 (c), below:
§ 129.19 Air traffic rules and procedures
(a) Each pilot must be familiar with the applicable rules, the navigational and communications facilities, and the air traffic control and other procedures, of the areas to be traversed by him within the United States. (b) Each foreign air carrier shall establish procedures to assure that each of its pilots has the knowledge required by paragraph (a) of this section and shall check the ability of each of its pilots to operate safely according to applicable rules and procedures.
(c) Each foreign air carrier shall conform to the practices, procedures, and other requirements prescribed by the Administrator for U.S. air carriers for the areas to be operated in.