I have a 1980 D50 2.6 that I replaced the fuel pump. Now the engine will start but run only for a minute or two and then the carburator floods out and the engine dies. Its so wet thereafter that it will not stop. Its mainly the passenger side of the two barrels. Could the fuel pump be defective? It wasn't doing this prior to the new fuel pump. Any help will be greatly appreciated!! Thanks in advance!