My everyday driver is an old Land Cruiser; long ago, I fitted extended range fuel tanks; capacity is 180L (just shy of 50 US gallons.) On several occasions, I'

My everyday driver is an old Land Cruiser; long ago, I fitted extended range fuel tanks; capacity is 180L (just shy of 50 US gallons.) On several occasions, I've had attendants come out to ask a question or two when filling up - my guess is some kind of warning sounds inside if you pump too much fuel in one go from the pumps intended for smaller vehicles. (One attendant kept looking nervously on the concrete the car was parked on - half expecting to find us standing in rapidly expanding a puddle of diesel...)