<----Ex welder.

I'll do it for you. Those are hard lines. Don't get the arc on the line, and you'll be fine. Basicly, don't put the wire on the line. You'll be fine.

I've welded on a gas tank before and had no problems. Of course, I removed it from the car, and filled it with water before attempting it, but it CAN be done. When the line is full is when it's the least volitile. Gas FUMES are flamable, not the liquid. Whats in the line? Liquid, not vapor (hopefully) Since it's a hard line, the sparks will bounce off and no problem.