I can assure you that pump manufactures take grounding to heart. Any metal parts that are surronded by plastic( a card reader for example) are connected back to the frame.
Hoses do have a wire in them for that reason but they can and do break. Some fire depts. make stations check to see that it is whole.
Static from newer vehicles seems to be a real problem. In the winter I get a staic shock from my 2003 GMC every time I get out of it. I believe if you read the warning label posted at all Mobil stations it instructs you to touch the pump before grabbing the nozzle. It also instructs you to leave nozzle in the car in case of fire.
