There have been a lot of old-car fires lately. I went through the ’70s, the ’80s and most of the ’90s without ever having read much about car fires. Suddenly, they are happening all over the place.

Fuel lines, filters, pumps, and regulating devices exist for a specific task-to deliver gasoline or alcohol from the fuel cell to the carburetor, and, in a bypassing system, return it to the fuel cell ...