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gas gauge false empty

  1. 2011 - 2014 Mustang GT and Boss 302
    I just did the first fill up of my gas tank after I saw my gas gauge go from one quarter left to empty in several seconds. I filled the tank and it took only 9.6 gallons! I found out that there is a Ford TSB on this problem-TSB10-21-3 that was dated 101910 . My GT was made on 111810-almost a...