What is the fuel grade and color?

What is the fuel grade and color?

• A. AVGAS 100LL, Bluish
• B. AVGAS 100LL, Colorless
• C. AVGAS 80, Bluish
• D. Jet A, Colorless

Answer: (A)

Understanding fuel identification helps prevent misfueling. For piston-engine aircraft, the common AVGAS grade is 100LL, which is low-lead and high-octane. A distinctive blue dye is added to this fuel, so it appears bluish. That visual cue—blue for 100LL—lets ground crews and pilots confirm they’re handling the correct fuel. Jet A, in contrast, is a turbine-engine fuel and is colorless, not blue, so it doesn’t match AVGAS labeling. Other AVGAS grades exist, but they don’t carry the blue dye associated with 100LL, so they wouldn’t appear bluish.

Understanding fuel identification helps prevent misfueling. For piston-engine aircraft, the common AVGAS grade is 100LL, which is low-lead and high-octane. A distinctive blue dye is added to this fuel, so it appears bluish. That visual cue—blue for 100LL—lets ground crews and pilots confirm they’re handling the correct fuel. Jet A, in contrast, is a turbine-engine fuel and is colorless, not blue, so it doesn’t match AVGAS labeling. Other AVGAS grades exist, but they don’t carry the blue dye associated with 100LL, so they wouldn’t appear bluish.