91 350 TBI Went wheeling yesterday on my used 35"x14" X10 " rims , trimed to fit (some minor rub on front of the fenders still /forums/images/graemlins/grin.gif , and no lift /forums/images/graemlins/eek.gif) Heard what I thought was a rock or something stuck in a drum (pulsing squeal that changed with speed) When I stopped it was a solid high pitch whine comming from the rear of the truck. (over the rear diff.) I am wondering if this is the fuel pump on it's way out (a little warning) Has anyone else had this problem? Or is there anything else I should know about the fuel pump ? Thanks .