89mustangfive0

hey everyone im gonna be installing my external fuel pump tomorrow. i was wondering how you guys who run them have them wired up. i came across the instructons on the t-rex install on vortechs websiteand they have a wire run from the fuse box. cant it just be wired straight from the inertia switch in the back?? also do i need to run a fuse? thanks ( the instructions i have suck!!) its the walbro version of the t-rex pump. thanks