Midway down the feed line, Blow-By places an included Aeromotive fuel filter to catch any trash. The feed and return lines are routed along other lines, and secured using clamps and tie-wraps. You can see the return line in this image as well. As its name implies, it returns unused fuel back to the tank. Of course, since a factory Mustang uses a returnless fuel system, the car must be tuned to accept this change.