Mazda is recalling 42,000 Mazda 6 cars in the US because spiders can weave a web in a vent hose and cause the fuel tank to crack, the Associated Press has reported. The recall involves cars from the 2010 through 2012 model years equipped with 2.5-litre engines. The yellow sac spider, which is attracted to hydrocarbons, builds webs that cause pressure to build in the fuel tank. That increases the risk of fuel leaks and fire. Mazda will update the cars’ software for free beginning this month to ensure that the fuel tank pressure doesn’t build up.