Sorry but the only smells that enter the cabin either go down the inlet of the engines or into the inlet of the APU.
The answer is as Eckhard said the transit of the LE (group B) infront of the fuel jetteson nozzle may cause fuel to come into contact with the trailing edge.
This pic is not bad for reference.
http://www.!!!!!!!!!!!!!!/open.file/173455/L/