Mazda is recalling 42,000 cars because of spiders.
Mazda reports spiders may build webs in a vent hose, and cause the fuel tank to crack.
That can lead to an increased risk of fire.
The recall affects 2010 to 2012 Mazda-6 cars.
It's for the ones equipped with 2.5 liter engines.
Mazda says it will notify owners.
Dealers will fix the problem at no charge.