[04ctd]

...if i was gonna run 3 pumps, i would use "monster cable" type stereo wires to power them, and make sure they had plenty of power & ground back there.

your battery puts out 12v, but your alternator puts out 14.4v
you should be able to add a wire to the alternator output post, and apply the 14.4v output to the relay/wiring system for the pump, instead of tapping off the battery, and getting 12v.

if you want to get real tricky, you could run the "sense" line for your alternator back to the very terminal of the pump, and then, the alternator would sense the Voltage there, and try to keep 14.4v on that terminal.

IIRC, they used to sell harnesses for the Eclipses, or one of the rice cars, that ran larger gauge wire & came direct off the battery for a similar effect = more stable fuel psi

HTH, that's a cool toy