id keep the stock pulse line. its a hassle on a carburated xlt unless its already efi and you droped in a carburated motor.
otherwise cap it off and you could bypass it if you already have the electronic setup. hope that helps. need a little more info on the motor, year and what your setup or plans are. if you have a carburated motor and are doing the switch id upgrae the needle n seats for sure.
did your fuel pump take a $hit? its like $9 from dennis kirk to get a rebuild kit. ive done many of them.