Hi there! This is for a C217, but I'm cross-posting it here, since it's a variant of the W222, and this forum is far more populous.

I just purchased a '15 S 550 Coupe (with a July 2014 build date and a very early VIN). Only 60K miles. And it's rather well-equipped, too. I am aware of the Silitec cylinder-lining coating, which my car unfortunately has. I was not aware of, and did not anticipate, the horrible fuel smell I'm getting when inside the cabin, and outside the car. Here's what I can say:

• The smell is potent outside the car for as many as 12 hours after it's last been driven, and is currently stinking up my entire garage
• The smell is drawn into the cabin by the HVAC system. I smell it strongly in the cabin when using the HVAC in normal mode, faintly in recirc. mode, and not at all if the HVAC is off and all the windows are shut
• I'm getting normal fuel economy, so I doubt there's a leak in the tank
• There are no malfunction-indicator lights present

The most likely thing, I think, is the charcoal canister. I understand that to involve removing the rear wheel and fender liner, which I'm perfectly okay to do. But I don't want to fire the parts cannon at the car. I'm also impatient to fix it, and I suspect the Benz dealer and independents will say they can't get me in for an appointment until next week. So I'd like to solve it myself, if possible.

Has anyone else had this issue?

I have had it before in my car as well. It turned out to be a low pressure pump . I could only smell it when the engine was cold . There's also a thread in the W222 Forums too , and it was like "strong fuel smell" as I recall.
Take it easy

I managed to get in with an independent Mercedes-Benz/Lexus shop. They got to the car pretty quickly. Turns out, there's a pin***** hole in the fuel pump, and it's just spraying fuel everywhere. Sigh.

Well, at least it's an inexpensive repair, to replace the fuel tank and clean all that up.

Nice to hear it was a quick troubleshooting and inexpensive as you said it

CL and S Coupes were just .........darn good looking cars imho Keep it forever.