I didn't take any pics.
I ran my 3/8" steel fuel line on the inside of the frame rail ... then I slid foam rubber insulation over it, sold at Home Depot for 1/2" water pipes (4 4-foot lengths for 2 bucks!) ... and secured the fuel line at both ends only, using vinyl clips screwed to the frame and a couple of vinyl ties in the center areas.
It worked out really great! The foam rubber is really thick and covers the fuel line the entire length of my frame rail.
PS: I taped the end of the fuel line before sliding it through the frame rail to be sure I didn't scoop any dirt into it.