Which method can be used to test fuel quality?

Conducting a visual inspection for color and clarity is an effective method for testing fuel quality because these visual characteristics can indicate various issues with the fuel. For instance, discoloration or cloudiness may suggest contamination or degradation due to age, the presence of water, or other impurities. A clear and clean appearance typically indicates that the fuel is in good condition, while any abnormal colors or particles can signal that the fuel may not meet the required specifications for proper performance.

Visual inspections are often the first step in evaluating fuel because they provide immediate information that can help identify possible problems before more advanced testing methods are employed. Although the other methods mentioned can be useful in specific contexts, they are generally more technical and may not provide as quick or intuitive an assessment as a visual inspection.