I just don't see how a bad fuel filler cap would adversely impact fuel delivery and fuel management, especially when fuel trims exist. (mechanics.stackexchange.com)
, much shorter rear side - doors, a differently shaped and placed fuel filler cap and a different rear door. (evo.co.uk)
A flex - fuel vehicle will usually be identified by a badge, and by a yellow fuel filler cap. (autofocus.ca)