My gas gauge shows empty and the red light comes on but tank is full. My neighbor says it is the float since the red light works. My service manual is MIA (wife moved it)so how do we get the float out? Drop the tank or is their access from the trunk. The tank is full as I thought it was empty and was filling it up and the shutoff stopped it at 10 gal. At 8 mpg, it would take about 200 miles to empty?