Quote:
Originally Posted by Brian R.
They may be right about the source of the trouble code, but there are many other possible causes. The EVAP system is one of the most complex systems in the truck. If you don't solve the problem by not overfilling, and you want to troubleshoot it yourself, come back and I can give you some additional possble sources of this code.
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I'm pretty certain that the gas cap is securely seated, so I'm ruling that out. The vehicle ran without a glitch all day yesterday after having the codes cleared on Tuesday night. But this morning the trouble lights came back on, so I'm going to stop by Advance Auto again to have the codes checked and cleared. I presume that I will see the same codes: P0441 and P0455.
So, aside from the gas cap, what else should I check?
I thought I would crawl under the vehicle and try tracing the line from the fill tube to the evap canister to see if I can find any cracks or loose connections. The vehicle is only 3.5 years old with 45,000 miles and is garage-stored, I would be very disappointed to find a deteriorated rubber hose already.
If it is the canister, how can I verify it and what can be done to correct it?
Thanks for the help!