Fuel pump

I have a 1968 fury iii 318 you can give it full throttle it will disappear fuel in the filter few mins later it will be dry as a bone the fuel filter does not keep gas in filter while on throttle but will idle with fuel on filter all day long but once you blip the throttle it’s gone could this be bad fuel pump or what any help would be great I’m still learning on the old cars I’m a newbie