Cannot solve P0455 large evap leak

1TrackJack

Member
Original poster
Joined
Dec 31, 2019
Messages
65
Location
Clearwater, Fl.
I have like new stock 2004 Rubicon with 80,000 miles with a PO455 code. I was rear ended a couple years ago and after repairs my check engine light came on. I took it back to the body shop and they said they replaced the canister, light went out. Then some months later the code came back. At the time I was really busy with my business and didn't use the Jeep much so I just let it go and put a piece of electrical tape over the light. The Jeep runs fine no issues at all.
I now want to sell the Jeep and took it to my mechanic to get the issue fixed. My mechanic has been all over it and cannot find the problem. By the way he said the body shop did not replace the canister. All he found was a new hose clamp. He is going to perform some more smoke test on Monday. I would think a large (massive) leak would be pretty easy to find. Any suggestions would really be appreciated.
 
Possible it's the hoses and elbows on top of the tank.

Smoke will answer all your questions... everything is speculation until that happens.

-Mac
 
Could be a crack in the fuel filler neck. I had that, among other things. When I got the Muddog, my mechanic and I spent two YEARS chasing down Evap leaks. The final fix turned out the the Schrader Valve Smoke test port leaked. We couldn't get another one, so he just replaced it with a piece of hose. It's been fine ever since. (I kept the valve just in case we ever needed it to smoke the thing again.)