I have an old tiller given to me by my grandfather. It is a 5
horsepower Brigs. The carb is mounted to the gas tank. It would only
run with starting fluid for 10 seconds then shut off. I took the carb
off to clean it but there is a long pencil looking plastic tube from
the carb that goes into the gas tank. It has a screenon the bottom of
it. It broke off.

Do I need to replace it and what could be wrong with it not starting?