Originally Posted by 029s

I would recommend using a relay. Be careful about just plugging in something that draws that much juice into your electrical system. Run a small wire from a ignition source to the relay. Then run a heavier gauge wire from the battery to the relay then to the pump. When you turn on the car the small wire will flip the internal switch in the relay and the relay will pick up the load and carry the heavier current on the larger wire to the pump. If you use a small wire from your fuel system for the power supply to the pump you run a high risk of burning out the wiring. Those small wires were never designed for the kind of current a pump like that will pull.

I used a relay for my fuel pump upgrade on my last car and never had any trouble with it. They are cheap insurance for your wiring.
Just my .02.