How is 'liquid fuel leak' defined?

• A. Any fuel vapor that has not formed a liquid drop
• B. Any fuel coming from a vehicle's fuel delivery, metering, or evaporative systems in liquid form that has created a visible drop or puddle
• C. Any fuel spill from the exhaust system
• D. Any fuel leak that occurs only when the engine is running

Answer: (B)

Liquid fuel leak means fuel escaping in liquid form from parts of the vehicle’s fuel system—such as the fuel delivery lines, fuel metering devices, or the evaporative system—and you can see it as a visible drop or puddle. The key is the liquid state; a fuel vapor that hasn’t formed a liquid drop isn’t a liquid leak. Leaks from the exhaust system aren’t liquid fuel leaks, and the presence of a leak isn’t limited to when the engine is running—the liquid can be seen whether the engine is on or off. So, if you observe liquid fuel pooling or dripping from fuel-system components, that’s a liquid fuel leak.