An internal combustion engine includes tubular roller valve and a fuel injector assembly. The fuel injector assembly includes a fixed tubular outer insulator with holes and a fixed inner insulator with holes. A rotatable tubular valve is between the fixed outer insulator and the fixed inner insulator, the rotatable tubular valve having holes in a staggered configuration. A fuel injector is connected to each of the first fixed holes of the fixed tubular outer insulator. When the rotatable tubular valve rotates, fuel is given to only one of the fuel injectors at a time.