What describes a CNG system that supplies fuel to an auxiliary engine on a vehicle?

The term that best describes a CNG system that supplies fuel to an auxiliary engine on a vehicle is the mobile fuel system. This terminology suggests that the fuel system is designed to be flexible and portable, allowing the CNG to be used in various applications, particularly for auxiliary engines that may not be located on the main vehicle itself.

Using a mobile fuel system indicates that the setup is specifically engineered to deliver compressed natural gas to engines that might require additional power, such as generators or other supporting machinery that operate alongside the main vehicle engine. This differentiation from a standard motor fuel system or an auxiliary fuel system is crucial because those systems may not emphasize the mobility feature or might cater to different structures of fuel delivery.

By focusing on the characteristics of a mobile system, it becomes apparent that it underscores the versatility and situational adaptability of the CNG delivery process, especially with auxiliary applications in mind.