I've installed a walbro 255 fuel pump and aeromotive fpr using stock voltage to power up the fuel pump. My problem is that I'm not getting enough fuel pressure (it's reading at 14-15 lbs). I've checked all lines and they're all good (no leaks or kinks)..I've also replaced the old fuel filter for a new one, but still getting low fuel pressure..so my guess is that I may need a 12 volt rewiring kit? or maybe the fpr is bad?? I've also pinched the return line on the fpr and it spiked up to 55 lbs. I'm stumped, your help would be appreciated. Thank you.