Mazda once announced a recall on 42,000 Mazda 6 models built between 2010 and 2012 and featuring the 2.5-litre four-pot.
Terrifyingly, it’s because the Yellow Sac spider was attracted to the hydrocarbons in the vent lines, and felt so at home they began to build webs, which caused ‘negative pressure’ in the fuel tank. This pressure could have resulted in cracked tanks, or worse, fire.
Mazda originally installed a cover on the fuel line to prevent the Spider from entering, before reflashing the ECU to change the way it purged the charcoal canister.
Yep, you read that right. SPIDERS.