karanisawesome

Hello everyone. I wanted to voice a concern and maybe get insight into an issue I have been having with my Benz. I drive a 2016 C300 sport edition and have noticed this gas smell that has been increasing. Even when the engine is warm, the scent gets noticeably stronger when you rev the engine. I thought it might be a fuel hose line or injector, but I already had the low-pressure and high-pressure lines replaced under warranty in December 2023. I had a low-pressure replacement twice and a high-pressure one recently. There is no gas smell in the cabin, nor does it smell when you open the hood, only near the exhaust. I have to renew my registration soon and have a smog test coming up, so I need to get this fixed, or it won't pass. Dont, want to go to the dealer because they have screwed me over a few times over a few hundred dollars, and every time I complain, nothing is done. I was hoping someone could help me if they had a similar issue. There are no tunes or aftermarket exhaust parts; everything is stock, and I live near the Bay Area. I did want to note that I do see that my pipe is bent where the main exhaust pipe starts to split. y pipe, the left pipe before the muffler, has a dent from when a ladder hit the under part of the car. No accidents, though.

Any help would be appreciated.

superswiss

Smell of gasoline in the exhaust is typically due to an excessively rich air/fuel ratio. Your engine may be getting too much fuel or not enough air. You may have a blocked air filter, leaking fuel injector, or a defective mass airflow sensor. Near which Bay Area do you live? If here in the SF Bay Area take it to Griffin Motorwerke in Berkeley. They'll get you sorted out.

karanisawesome

@superswiss, thanks for the reply; I have soot buildup on the exhaust tailpipe, the chrome end. I replaced the air intake a few weeks ago in January and cleaned the intake hose and box out, and it looked all good. I do live close to Berkeley. I will look at the shop, but I wanted to take a shot at it first. Thanks for the info.

superswiss

Yep, soot is another sign of running rich.