leaks?
I'd be tempted to seal the whole tank with a gas tank epoxy coating. My buddy who does the Iron Butt with a fuel cell swears by it. He made his own cell from aluminum sheet. It holds not only fuel but also water, he divided the cell volume with a panel. One side holds fuel and the other holds drinking water. He sealed both chambers with different (suitable) epoxies. It's been working now for over two years.
I'd be tempted to seal the whole tank with a gas tank epoxy coating. My buddy who does the Iron Butt with a fuel cell swears by it. He made his own cell from aluminum sheet. It holds not only fuel but also water, he divided the cell volume with a panel. One side holds fuel and the other holds drinking water. He sealed both chambers with different (suitable) epoxies. It's been working now for over two years.