If you run a fuel cell, there are some requirements.
All the lines must run inside the frame rails. They are prohibted from being run thru the cockpit.
There must be an external shroud/or cover covering the exposed lines. The cell must have a ground strap.
If your running a welded on sump, same applys for the sheilding of the lines. It will be self grounding via the straps. Same applyes as to the lines.