One problem related to gas tank strap has been reported for the 1999 Chevrolet 1500. The most recently reported issues are listed below.
I was going to stop at a traffic light and the brake pedal went to the floor. I was lucky that there was no one in front of me and that I still had the front brakes. I limped it home and when I got back brake fluid was dripping out of the lines that run on the frame just under the gas tank. Everything under the truck is rusted. The rocker panels are also rusted out. The truck bed is rusted on all sides as well. I have also had to replace the straps holding the gas tank on. They were completely rusted. I had one strap that had fallen off when I took it in for repair.