ASME containers and cylinders on vehicles utilized for other than engine fuel systems, shall NOT be ____________ inside the vehicle.

The correct answer highlights that ASME containers and cylinders should not be stored, installed, or transported inside the vehicle when they are used for purposes other than engine fuel systems. This is primarily due to safety considerations. Propane is a flammable substance, and having these containers inside a vehicle poses a significant risk in case of leaks or accidents.

Storing, installing, or transporting these containers within the enclosed space of a vehicle can lead to dangerous conditions, such as the accumulation of gas, which can result in explosive situations if ignited. Thus, regulations are in place to ensure that the use of these containers is managed safely, ensuring that they are securely transported outside of the vehicle's passenger compartment or cargo areas designated for their safe handling.

While handling or moving, inspecting, or securing are important considerations, the specific regulation against having these containers inside emphasizes the critical nature of preventing gas accumulation in enclosed spaces, reinforcing the importance of adhering to safety standards related to propane handling.