I have a 1962 Cadillac Fleetwood Series 60 that I just rebuilt the carb on (Carter AFB). I am having an issue with the vehicle surging/bucking when given gas. I can get the car to idle just fine and go 5-10mph alright, then once I give it gas and it's over 15-20mph it starts surging and running like total crap. I pulled the car over and messed with the air/fuel screws on the carb and I can get it to idle fine again then once I drive it around it only takes a minute or so to start bucking again. I noticed that once I turn the key and power up the car it takes about 10 seconds or so to prime the fuel lines so the gauge reads. I have had 1 person tell me they believe my fuel pump is shot just by listening to my issues. Any suggestions? Any help is much appreciated!! Thanks.