I have got one of these with identical symptoms. I have been all over the car with my gas analyser pipe & nothing shows up. Removing the fuel cap I hear the pressure difference "hiss", so the tank is sealed well.

On road test, when I pulled up in a layby there was a definite increase in the smell & I wondered if the smell could be entering through the servo. I know that it is unlikely, as the vacuum is being drawn away from the servo but I am just bouncing ideas around.

Maybe the effect of braking is causing the smell to shift from the rear of the vehicle (petrol vapors being more dense than air). Perhaps the smell is coming through the vents???


Petrol smells are a nightmare to find (along with rain water leaks). Hopefully some one out there has found the answer.

Cheers

Dave