I'm going to be running E85 in my SRT4 van and want to make sure I have enough fuel. I was having an issue with my return line being too small and causing my fuel pressure to flutter so I ran a 3/8" soft line temporarily to alleviate that. I made the pressure line out of 3/8" stainless steel and when I drop the tank to put in a bigger fuel pump (I think I'm going to go with the Deatschwerks DW300) that's when I'll make the return line out of 3/8" stainless steel also.
I found when bending the line to put the tool in the vise to free up one hand to hold the line you are trying to duplicate. When you are making a bend, always hold the line you're duplicating so the bend is down. I found it's a lot easier to duplicate the bend if I'm holding the line so the bend is down instead of to the side. I also used hose clamps to hold the line together temporarily while bending because after a few bends it was getting too long to hold them together.
I used my brake line flaring tool to make a bulge at the end.