1. An enterprise fuel management system for managing fueling operations of a fleet of aircraft operated by a fleet operator having a central computer system at a data center and operating vehicles at multiple locations, the system comprising: a central data center in communication with the fleet operator's central computer system for forwarding data to the fleet operator's central computer system; at each location one or more data collection units for collecting fueling information and forwarding it to the central data center, the data collection units communicating the collected fueling information wirelessly to the central data center, whereby the data collection units are not in direct communication with the fleet operator's central computer system; and wherein the central data center gathers fueling information from the various data collection units and communicates the gathered fueling information to the fleet operator's central computer system as data messages for subsequent processing and action to enable the fleet operator to ensure that appropriate amounts of fuel are delivered to the aircraft during refueling.