Undefined Fuel-reserved For Proprietary -

As alternative fuels like E85 (flex fuel) or high-blend biodiesels enter the market, older POS (Point of Sale) systems may not recognize the new national codes, defaulting them to a "reserved" or "proprietary" status.

The fuel pump is sending a code that the back-office software doesn't recognize, causing it to fall back to a "Reserved for Proprietary" catch-all. undefined fuel-reserved for proprietary

During a recent transaction, the Point-of-Sale (POS) system or fleet card terminal returned the message: "Undefined Fuel-Reserved for Proprietary." This indicates that the fuel product code transmitted by the dispenser (typically in the 070–098 range ) is not recognized as a standard retail fuel type. Technical Root Causes: As alternative fuels like E85 (flex fuel) or