Slight Smell of fuel

Technical Area Engine, Transmission, Exhaust etc
1
  1. My model of MX-5 is: 1996 NA
  2. I’m based near: Scarborough
  3. I’m looking for technical help or recommendations on: The car has just undergone body repairs (sills, etc) and an annual service and MOT. Because there had been problems in the past with emission failure, I had the Lamda Sensor replaced with a genuine Mazda one (BPE8-18-861A). I now get a slight smell of fuel when, after a run, I’m stationary at traffic lights etc, or having parked the car up with the engine switched off. There are no visible leaks or damp patches and the smell soon dissipates when parked up. Any ideas as to the cause?