What action should be taken to protect the fuel system integrity?

Performing regular checks for leaks is crucial for maintaining the integrity of the fuel system because leaks can lead to fuel loss, environmental contamination, and potential safety hazards such as fire or explosion. Regular inspections allow for early detection of any weaknesses or failures in the fuel system, such as cracks or corrosion in the fuel lines and connections. Addressing these issues promptly helps to ensure that the fuel system operates efficiently and safely, maintaining both the system's functionality and compliance with safety regulations.

Other options, while they may contribute to fuel system management, do not directly safeguard the integrity of the fuel system in the same comprehensive manner that regular leak checks do. Ensuring only diesel is used could prevent issues associated with fuel compatibility, but it does not address existing defects within the fuel system. Reducing fuel tank size might reduce the volume of fuel stored but doesn't inherently protect the system's integrity. Limiting outdoor storage of fuel can help to minimize weather-related degradation, yet it does not facilitate routine monitoring for vulnerabilities. Regular inspections remain the most effective strategy for protecting the fuel system.