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I had a similar event with my '11 328i. The car threw a code for the dmtl pump around 8k miles. They replaced it, a week later I get another code, emissions. They say its the gas cap and replace the o-ring. Another week goes by and another emissions code comes up. This time they spend a day looking and decide to replace my gas cap all together. And you guessed it, another code. So I take it back and they do a leak/smoke test and fine that their tech broke my charcoal canister and they replaced it. Been good ever since, ask them to do a smoke test to see if you have a leak somewhere.
The gas could be a bad seal on the fuel pump. My mother in laws E92 335i had the same random gas smell and it turned out to be a poorly seated seal, have them check when it is back in for the emissions code, they may be related.
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