Which characteristic is NOT affected by moisture in LPG and CNG systems?

In LPG and CNG systems, moisture has several effects on characteristics like fuel combustion efficiency, corrosion potential, and operational reliability. However, fuel color is not influenced by moisture content.

Fuel combustion efficiency can decline when moisture is present, as water vapor can displace combustible gases, leading to incomplete combustion and reduced energy output. Corrosion potential is heightened due to the presence of moisture, which can accelerate the degradation of components in the system. Similarly, operational reliability can be compromised if moisture leads to ice formation in regulators or fuel lines, causing blockages or malfunctions.

On the other hand, fuel color in LPG and CNG is inherently clear and odorless, and moisture does not alter this fundamental characteristic. Therefore, fuel color remains unchanged, making it the correct answer as it is not affected by moisture in the system.