Switching it out through the rear seat will not damange the pump. The hardest thing about the fuel pump is getting the fuel line off of the connection, it's a [censored] and a hald, no way around that. HOWEVER, you will notice an increase in road noise. This is because the rubber cover no longer fits in place. I solved this problem by covering the hole with layers of duct tape, not the grandest solution, but hey, it's under the seat!
