2004 Dodge Ram 1500 5.7l Hemi 145,000 miles Im getting fault code p0456 evaporation emissions control system leak detected, very small leak check fuel cap. Ive checked everything I can see, I dont think its fuel cap, oring looks good. From my searches I saw that its bad to develop a leak...

Have a 2008 Ram 1500 with 5.7 L Hemi Truck keeps throwing p0456... There is a new mopar gas cap... The truck was smoke tested...nothing Was told that purge valve was ruled out. I've also changed the EGR Valve twice now and the PCM last year because it was malfunctioning, i.e. burnt 4WD and...