All trucks and cars have fuel pumps. The newer vehicles pump system burns less gas and emits less fumes. There is always a fuel pump system but it is just not as invasive.
Duramax fuel system has fuel pump and also means that ,The fuel pump is would be like a Denso common rail fuel injection system with pilot injection.That is a type of fuel pump.
All sorts of vehicles of all brands have different kinds of fuel pump. They either can be of mechanical type of fuel pums or can be of autometic fuel pumps.