A diagnostic fuel storage system is provided and includes a pressure sensor configured to monitor pressure at one or more diagnostic points within the system. The cometal structures may be coaxial and coplanar. The automatic segmentation module receives the digital image as an input, and automatically segments the target bone by utilizing an object-oriented approach. Also, a pivotally mounted barrel is provided as another embodiment for compressing the spring. In response to a turn of the tow vehicle, the drive linkage communicates a turn signal via rotation about the second vertical axis so as to cause the steering linkage to steer the caster wheel assembly in the turn direction of the tow vehicle. The microcode update file may include an executable program and after writing the microcode update file to memory execution may be transferred to the executable program.