What is typically used to conduct a pressure check after fuel system repairs?

The practice of conducting a pressure check after fuel system repairs is essential for ensuring the integrity of the system. Using air pressure not exceeding one half psi is a safe and effective method because it helps to identify any leaks without risking damage to the fuel system components. This low pressure is sufficient to test for leaks while remaining within safe operational limits to avoid over-stressing the system.

Higher pressures, such as those provided by a high-pressure air system, could potentially cause damage to seals, gaskets, or fuel lines, leading to further issues or unsafe conditions. Water pressure is not typically used, as it may introduce contaminants or pose a risk of corrosion if any water were to be trapped in the fuel system. Vacuum pressure would not be effective for testing fuel systems, as it does not simulate the operational conditions of fuel under normal use.

Thus, the choice of using air pressure at this low level is aligned with best practices in the industry for maintaining safety and ensuring accurate assessments of the fuel system's integrity after repairs.