I decided to update the fuel system on my 1951 Chevy 3100. I replaced the tank, sending unit, fuel pump, lines and filter. Issue I'm not having is that no fuel is pumping to the carburetor.

I disconnected the line ahead of pump and there is fuel there. Just incase I got a bad pump, just installed another pump and still have same issue. I attached a rubber hose to the pump inlet from a bowl of fuel, and still nothing. I'm going crazy, what can be the issue? Does vacuum advance play any role in this? I also replaced it.

I primed the carburetor and engine will start after some trying and will run for a bit, but stops as no additional fuel is coming.

 

Welcome from Florida. Was the fuel pump you replaced working? If it was, put it back in to see if that solves the problem. I have the same problem with a 1949 Fleetline. I tried several new fuel pumps without success. I finally put an electric fuel pump in it outside the tank. and now it runs.

 

Try hooking a hose from the outlet of the pump and running it into a bowl of fuel and trying again.