first thing you need to do is disconnect the battery, make sure the cables cannot come in contact with the mounting surfaces of the battery at all. no sparks!!!. Second, remove the gas cap. Third release the pressure in the line through the valve located to the right of the fuel rail on the fuel line. use a small screw driver and press the pintle in, stand away from the valve, and wrap it in a rag or towel as to prevent spray from getting on you, or your car.