Check gas cap?

[RedSRT4Me]

Just reading this yes disconnect your battery to clear codes. Then proceeded with further diagnostics. I sent you that video wouldn’t hurt to do a visual inspection of the tank and lines while your waiting to re connect your battery

It's not so much the tank or lines goes bad but the purge valve on the intake manifold and the leak detection pump on the gas tank are the two wear out items that will cause this.

One thing people don't mention is if you pull the rear fender liner out sometimes the connection from the gas cap fill port to the tank loosen up and leak. Check those clamps.

 

[Quick_Shifter]

It's not so much the tank or lines goes bad but the purge valve on the intake manifold and the leak detection pump on the gas tank are the two wear out items that will cause this.

One thing people don't mention is if you pull the rear fender liner out sometimes the connection from the gas cap fill port to the tank loosen up and leak. Check those clamps.

In his case I personally tightened up the lines a few months prior when I had the tank out for the sending unit problem. I also sent him a YouTube video of the common fail points