Here’s perhaps the oddest car recall you’ll read about. Mazda is recalling 52,000 of its Mazda6 sedans from model years 2009 and 2010 in the U.S. because a certain type of spider can spin a web in a fuel system vent line that can eventually lead to cracking of the system and ultimately cause the fuel tank to crack. [UPDATE: When including cars in other parts of North America, the total vehicles affected is 65,916, Mazda said.] We couldn’t make this stuff up if we tried, and a spokesman at Mazda’s U.S. headquarters in Irvine was just as surprised by the issue, which only affects Mazda6 sedans equipped with a 2.5-liter four-cylinder engine. No injuries or accidents have been linked to the issue, said Jeremy Barnes, but the automaker has received about 20 reports of the problem. The issue, Barnes said, is that a Yellow Sac spider can spin a web in a pipe that regularly becomes pressurized and then purges itself. The web can apparently interrupt this normal operation, which in turn can cause stress on the pipe and make it crack. While it’s not unusual for critters such as rats to crawl into engines, a small spider is a whole ‘nother matter, Barnes said. “I’ve never heard of anything like this in my 20-plus years,” he said. “It’s just an unusual situation and it’s related only to this engine. It’s due to the design of this fuel system.” Barnes said that furthermore, this recall only affects Mazda6 sedans made in Michigan, which are sold in North America. To remedy the situation, dealers will for free inspect affected cars, clean the canister and install a spring to prevent this type of spider from entering the vent line, according to the recall notice posted on the National Highway Traffic Safety Administration’s web site. The safety recall campaign is expected to begin o or before March 25. If you have additional questions or concerns, you can contact Mazda’s consumer hot line at 800-222-5500 .