Hello: I have been trying to make tight bends in fuel line for my gas tank breather line.  So far I purchased two different pipe benders but they don't make tight bends.  Long story short - I found a way.  Perhaps a lot of old hands here know of better ways but this works too.  I took a short length of metal fuel line that I had already crimped in previous attempts and tried this on one end:  I filled the short length with BBs.  Then I taped over one end to stop the BBs rolling out.  They wouldn't roll out the other end because of the crimp I had previously made in the tube.  Then I took two wrenches (box end ?) with the open end and closed end and put the closed ends over the tubing opposite each other and used the wrenches as levers with the tubing as the fulcrum.  I bent the tube just a bit and then moved the wrenches slightly along the tubing a few times, repeating the procedure each time until I had a 90 degree bend.  In case any of the BBs became lodged in the tubing, I then laid it on its side on an anvil and gave the tubing a few taps to round out any possible kinking.  Then I removed the tape.  If the BBs rolled out when I removed the tape, I knew I had achieved success and lo and behold, it worked.  No kinking and the bend is tight enough so I think I can weld this to my filler cap as a breather.  I hope this helps anyone attempting to make tight bends in small metal tubing.