Which component must be inspected as part of the liquid fuel leak inspection?

• A. Fuel delivery and return lines
• B. EVAP system valves
• C. Fuel vapor lines and hoses
• D. Fuel filter

Answer: (A)

The main idea is to look for visible leaks in the parts that actually carry liquid fuel. Liquid fuel leaks show up along the paths that move gasoline from the tank to the engine and back again. Those are the fuel delivery lines and the return lines. If a line is cracked, damaged, or has a loose clamp or fitting, gasoline can seep out as a liquid, creating a fire hazard and environmental concern. That’s why these lines are the primary focus for a liquid fuel leak inspection.

EVAP system valves and fuel vapor lines deal with gasoline vapors rather than liquid fuel, so they’re checked for vapor leaks rather than liquid leaks. The fuel filter can be a leak point too, but the most direct and common sources of liquid fuel leaks are the delivery and return lines that carry liquid gasoline under pressure.