My main fuel pump makes a humming noise in my 82 spider. After replacing the fuel filter it still hums. If I drive the car for long periods of time (1 hour or more) and it is warm the car will chug at me. Meaning when I accelerate on the gas my car feels as if fuel is being cut off. It chugs at me. it is hard to describe. Regardless, I need to know...Should I purchase a new fuel pump? If so where should I look into gettings one. Thanks!