Final answer:
The use of a rubber grommet on a fuel hose is generally recommended to prevent wear and extend the life of the hose by providing a protective buffer between the hose and any abrasive surfaces.
Step-by-step explanation:
The question is about the necessity of using a rubber grommet when installing a fuel hose in a mechanical or automotive context. In general, a rubber grommet is designed to protect hoses, wires, and cables when they are threaded through metal or other rigid materials.
Using a rubber grommet on a fuel hose can help prevent abrasion and wear caused by the hose coming into contact with metal edges, which can lead to leaks or damage over time. While it may not be strictly necessary in every situation, it is generally recommended to use a rubber grommet to extend the life of the hose and maintain a safe system. Whether or not a rubber grommet is necessary in a specific scenario will depend on the design of the system and the environmental conditions to which the fuel hose will be exposed.