You can choose the hydraulic fuel injection pumps, as they are differed from the piston.
There are also pneumatic piston fuel injection pumps, such as a fuel injection pump, air injection pumps, and pneumatic piston fuel injection pumps can be divided into two types: pneumatic, and piston fuel injection pumps. They have better fuel efficiency and are more convenient to utilize as many fuel injection pumps as they are designed to improve fuel efficiency.