Why isn’t fuel going to the carb?

Just asking you, did you fill the new tank a 1/4 to a 1/2 with gas? First I would verify that the fuel was getting to the fuel pump, disconnect the gas tank fuel line to the pump, put a piece of hose on it and suck on it to see if you get fuel ( I know you will get a mouth full of gas if it is not clogged) then you will know if the sender is the problem or not. Next connect the fuel line from the tank back on the fuel pump and disconnect the carb fuel line and add a piece of hose to it, put it in a can and try turning the motor over to see if the pump is working, (did you add a fuel fliter and is it connected the right way) that way you will know if the pump is working and fuel is getting to the carb.