Who is at fault when you back into a car that is illegally parked in the fire lane.?

The driver of the vehicle in motion. The fact that the vehicle that was struck was illegally parked has not bearing on the responsbility of the driver of the vehicle that caused the damage. Well, technically you would be At Fault. You can always take it to small claims court that the car was blocking you in, by being parked illegaly in the fire lane, you thought you could get out, but underestimated the driving room. Also, to help you is to get pictures of the car in the fire lane. OR, you could consider it a hit and run?