I just refitted all my fuel lines with 1/2" aluminium tubing.
Tube cutter, single flaring tool and tube bender all cost about $10-15 each. Available from your local hardware or plumbing shop. You can either buy a pipe/tube bender, or I used a flat wound spring that slides inside the tube. You can then hand bend it to shape, but it's real hard to get a nice uniform tight radius.
Getting the flare just right will take a bit of practice. The tighter you squeeze it the better/flatter the finish for a good seal.
When cutting the pipe, take is slowly. This will avoid a large overhang of metal on the inside circumference of the tube.
Here's a pic of what it looks like with 1/2" aluminium tube and some tube nuts. Remember to put the collar and tube nut on before you flare the tube!