Interesting thought. It's been sitting for a few months while I searched for someone willing to tackle the deletes. The battery did fully die and we put a trickle charger on it for a good 48hrs before starting it up. It threw 16 codes which I then cleared to see which actually came back.

There is a high pitched whine noise coming from the tank area though which says to me there's definitely something related to the fuel pump going on which the code would back up.

But I have to wonder if maybe some of those others are still battery related