Unless the paint on your tank is made of sand paper I bet it was rubbing on something else.
Originally Posted by southwade
My zipper jacked up yesterday. It split open (open on both sides of the zipper pull).
I'm thinking it got pinched from me gripping the tank with my legs. I've been noticing sometimes it'll get bunched up at my knee when riding and when I squeeze the tank it digs into my inner knee.
Took forever to get the zipper straitened out and working again. Sucked.
This is only about 350 miles of wear:
That's the fabric that separates the zipper from my gas tank.