The new recall includes model years 2010 through 2012.
The yellow sac spider is attracted to the hydrocarbons in gasoline and can find its way into a fuel tank hose, said Mazda spokesman Jeremy Barnes. There, it may weave a web that blocks airflow. That could cause the fuel tank to crack and, possibly, a fire. Mazda said it is not aware of any fires due to this issue.
Mazda designed a special spring to prevent the spiders from getting in. But sometimes the spiders find a way, so it also designed a software fix to alleviate pressure on the fuel tank and prevent the cracking.