I used Galvanized Zinc Fuel Line from Jegs. It is already annealed and is really easy to work with.
http://www.jegs.com/i/JEGS/555/63036/10002/-1
The Original Heavy Duty-Plated TubingHeavy duty original equipment type double wall copperized steel tubing which is coated in galvanized zinc for superior rust protection.
Heavy Duty-Plated tubing w/Chip Resistant Powder CoatingThe same construction as the original plus features our durable gloss black or silver powder coating that resists cracking or chipping in the fabrication process for long life and years of service. For the professional touch!
Each kit includes 25' of tubing and an assortment of standard inverted flare fittings for domestic vehicle applications.
With the bed off my truck I was able to run one line from the tank all the way to the fuel pump. Also, I used AN fittings for the end connections, just 'cause I have a Rigid AN Flaring tool.