[icelandelf]

I thought of the Dog Whisperer as well. My thought is that she is having a reaction to the sound of the engine, the smell of the diesel fuel, or a combination of both.

(As an aside--We used to have a cat that would freak out when someone rang the doorbell. She loved people, but our guess was that there was a frequency in the door chimes that really upset her. She would run and hide, then come out after a little while and be perfectly happy.)

Good luck!