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perfect timing on this topic , I have an 04 grand cherokee , got a P0455 code for gross leak. took it in they smoke tested it and found a decayed hose in the back at the evap can ??? fixed , cleared all is good , till yesterday it came back ???

Should I replace he gas cap since what I found online pointed to that as being the cause of this ?

If you took it to Autozone or OReilly, they would have first sold you a gas cap. The dealer did you a favor to actually trouble shoot the problem. I discovered this the hard way with my Durango. Yeah, I bought two gas caps (dummy me) and then dug into the FSM that directed me to the bad hose under the car. Oh, and the emmission check place told me I needed a new gas cap too after they tested it. The hose repair fixed that too.
Craig



That's all well and good , but it's BACK .

The original repair was under the used car warranty and that ran out right after I had it supposedly fixed , it took 2.5 hours last time. I'm not going to pay 95/hour to sit around and wait for them to TRY something else ...