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Im not too familiar with the C250s but if I remember correctly they have high pressure fuel pumps, which would be located on the back of the engine near the fire wall.. Ive read some owners report gas smell and its due to either a faulty high pressure fuel pump or the lines/fittings going bad on them. Open the hood, does it stink of gas? Look around the fuel line for any leaks. Also the fuel tank is right under the rear seat, have to remove the rear seat to get to it. Sniff around back there to see if theres a strong gas smell, if not thats probably not the issue. I also remember something about an extended warranty on the high pressure fuel pumps, not sure if a strong gas smell is a result of that though.
I remember coming across people having the same hose breaking and having gas fumes as a result. Looks like the replacement part can be expensive, some people got creative with the repair.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
