Gas leak

What is your question?

I have a gas leak underneath the car somewhere around the tank. I dropped the tank thinking it was the fuel pump but the area around it was completely dry but the corners around the tank were wet but I couldn't find any defect in the tank or the lines on top of the tank. What could be leaking the gas. I have pictures as well.

What makes this problem better or worse?

It's worse on a full tank somewhat better as the gas lowers.

How long has your 2008 Pontiac G6 had this problem?

I fixed what I thought was the problem 3 weeks ago and then it came back. It's been one week now.