For commercial pilots and truck drivers in 2026, fueling while "off duty" is generally a violation of safety and logging regulations. According to both the FAA (for pilots) and the FMCSA (for commercial drivers), fueling is considered "On-Duty, Not Driving" work because it is a task directly related to the operation and safety of the vehicle. If a truck driver fuels while their electronic logging device (ELD) shows them as "Off-Duty," they are essentially "falsifying their logs," which can lead to heavy fines, "out-of-service" orders, and negative impacts on their company's safety rating. For pilots, "duty time" includes all time spent performing tasks for the airline, including pre-flight inspections and supervising fueling; trying to fuel while "off the clock" would be a major breach of the Rest Requirements designed to prevent fatigue. In short, any activity that involves the physical maintenance or preparation of the transport vehicle must be recorded as "On-Duty" time to ensure that operators are legally rested and compliant with federal safety standards.