First check if the hoses are all correct... 3/8 or 5/16.... which is spec for your ride??... is there a mismatch.... then .. is your new fuel pump output threaded so you can choose a barb to be conducive to your line size up to the carb,,, from "barb to carb" should be all one size.... the difference might not seem much (5/16 to 3/8) but its like the difference between your honeymoon night and the 20th anniversary!!......