Roughly described, a fueling control system includes a nozzle module for use with a particular fuel dispensing nozzle, a vehicle module for use with a particular fuel tank inlet, and a site controller. In particular, methods and apparatus are provided for substantially reducing andor canceling third order nonlinearities in circuits, devices, and systems such as amplifiers and mixers. In this method, during normal operation, a first clock signal is received and transformed to output a second clock signal in the clock signal line, wherein the second clock signal has a first duty period. An ejection collection device is supported by the carriage and collects spent shell casings and links ejected from the machine gun for discharge through the pintle.