I have a Briggs engine on my riding mower. The fuel line where it goes into the carb there is a plastic right angle fitting. Gas is leaking from around the plug. Does the plug have threads. How can it be replaced?

Hi,
Most one with plastic are pressed into the body of the carb. It is difficult to give a definitive answer since no numbers were provided. Most will have plastic nipples attached to metal bodies, some of which are threaded and most not.
Peace,
Clarke