Not sure what you're asking but you probably need to rebuild the carb. That or buy a holley or better carb. I've had a lot of edelbrocks and have never really been happy with them.
the needle and seats are sticking ...you fix a holly by tapping the upper mixture screws .... the edelbrock may be solved by tapping also prob trash in the carb
mechanical fuel pump?
im not sure but if that could possibly leak into the pan but its my best guess. how did you drain 5 gallons out though, thats ALOT!