ok, I installed my new holley fuel pump and it runs great, but it's still hesitating at about 4500 rpm. But I did have the insight to put a clear inline fuel filter going into the carb. I took the internal filter out. When I start the car the canister fills right up. Then when I drive it hard and it starts sputtering and almost dying. After I get home I open the hood and there's barely any gas in it. Why would it fill instantly at start up but then become starved at higher rpms and not refill even after I slow it down. The more I'm seeing it, the more i'm thinking this is a fuel related problem I'm having with my car. Oh yeah it's a 1979 Chevy 350, stock HEI ignition, Quadrajet, aluminum intake off the original 305 H.O.