One problem related to other fuel system tank assembly has been reported for the 2012 Porsche 911. The most recently reported issues are listed below.
Porsche 991 911 and 981 cayman/boxster models have an issue where the foam pads securing the fuel tank degrade or fall out. The initial manifestation is a squeaking sound where the plastic tank rubs against the metal body of the car. With prolonged movement the fuel tank can be damaged and a fire could result. Porsche is aware of the issue and has an internal service bulletin to fix it but only for customers under warranty. They claim the issue is only a squeaking sound but common sense would dictate plastic rubbing on metal several times per day will wear and start leaking. Fuel tanks should be secure and not bouncing around. Please investigate the matter further - hundreds of owners have had the issue of an improperly secured gas tank.