Check engine light ...OBC will not read..every "expert" I have asked tell me it is air leak on gas tank pressure..HELP

Nobody can possibly know what the trouble is without testing!... It's time to stop asking questions and have a mechanic check the truck out to find out what the problem actually is instead of a bunch of so called experts guessing at it... You'll save money by doing it that way! .. I'm sorry but that's just how it is.