Mercedes-Benz C300 fuel smell inside the vehicle on Mercedes-Benz C300

Some Mercedes-Benz C300 owners report experiencing a fuel smell inside their vehicle due to several potential issues. These include exhaust leaks that may introduce unburned fuel into the cabin, as well as problems with the high-pressure fuel pump, which is a common source of fuel odors in the C300 W205 with the M274 engine. Additionally, some owners have reported defective fuel hoses, which have led to class action lawsuits due to raw fuel leakage in the engine compartment. Mercedes has also extended the warranty on the low-pressure fuel hose due to concerns over gas smells inside the cars. Furthermore, issues with the rubber fuel hose connected to the high-pressure fuel pump at the rear of the engine can contribute to these fuel smells. It is recommended that owners experiencing this issue have their vehicle inspected by a qualified mechanic to ensure prompt diagnosis and resolution, providing details about the potential causes to facilitate the repair process.