[Tacoma Bob]

Mark, forget the gasoline issue for a while. Have you checked your ignition switch and ammeter connections. Remember shiny,bright and tight. If those connections are at all loose they will heat up to a point of no longer connecting hence the car stopping. Then wait 15 minutes and it magically starts up. The reason..........the connections have cooled down enough to re-connect. you drive down the road and the whole process repeats itself. I had this issue on a 77 Chevy low rider I built a few years back. I spent $600 chasing the same ghost. finally a savvy auto electrician knew before he even looked at the truck. I limped into his shop. We let it cool for twenty minutes. He fired it up and reached up under the dash tugging on the main ignition wire. Died right then and there. "Common problem on 77 Chevy trucks" he said. "pick it up at 5pm and bring a hundred dollars.