My home oil heater has a smell of fuel oil when it blows out warm air. what is wrong?

under low temperatures, this > > equipment automatically starts and i can hear it running; the problem is > > that when i stop the car, i feel a very bed smell, ... I've noticed it occasionally, but not the smell > getting inside the car - my TiD has the ACC heater so maybe this stops > it. Do you have ACC or a manual heater