What labeling must appear near the reciprocating-engine fuel filler regarding fuel grade?

• A. It must include the maximum fuel grade
• B. It must include the minimum fuel grade
• C. It must include both maximum and minimum grades
• D. It must include the color

Answer: (B)

The important idea is that the label near the reciprocating-engine fuel filler must show the minimum fuel grade that may be used. This ensures anyone fueling knows the lowest octane or grade acceptable for that engine, so they don’t accidentally use a fuel that’s too low and could cause knocking or damage. Using a higher-grade fuel is generally fine, so there’s no need to specify a maximum. Colors aren’t the required information for this label, though color coding may exist separately; the critical detail is the minimum grade. For example, if an engine requires 100LL, the label should indicate that 100LL is the minimum acceptable grade.