If this occurred on a private fleet site, confirm if the "Proprietary" code is intended for specific internal tracking that requires special authorization on the user's fleet card profile. FLEET CARDS – REPORTING OF ALTERNATIVE FUELS
The phrase "Undefined Fuel-Reserved for Proprietary" is a standard diagnostic or reporting label used in fleet management and petroleum transaction systems (like undefined fuel-reserved for proprietary
While practical, the concept creates tension on the tarmac. Pilots are trained to know exactly why every kilogram of weight is on their aircraft. Fuel is heavy, and burning unnecessary fuel to carry extra weight costs money and increases emissions. If this occurred on a private fleet site,
Systems like Fleet Cards use these proprietary slots to track non-standard transactions, such as specialized biodiesel blends or marine fuel oils that may not have a universal POS (Point of Sale) code yet. Fuel is heavy, and burning unnecessary fuel to
While it sounds like something out of a sci-fi novel, it is a common headache for fleet managers and IT professionals in the petroleum industry. Here is everything you need to know about what this means and how to fix it. What Does This Error Actually Mean?