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old: e82 MSport N47 120d. current e82 MSport N52 125i.
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I get quite a fuel smell from the exhaust when I cold start mine and others with the same engine say the same but that's the N52 i6 engine. Your 116i has I think the N43, not sure if that does it also. Does it only happen when cold?
 

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Pin hole leak on fuel vent hose is a common issue. For me, worst when fuel is full, nothing when less than 1/2.

Parts are cheap - just a plastic hose, but it's a messy job - fuel tank has to be partially dropped.
 
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