I have an old Montgomery Ward, with a Tecumseh engine, snow thrower
that keeps running when I take the plastic key out. I turned it off by
turning the choke down. I notice the other day that it was leaking gas
( I think from the carb) when the key was left in and seemed to have
stopped when I took it out. How does the key work and is this
something I need looked at or fixed??

Thanks