Which component is a fuel filter that must be inspected for liquid fuel leaks?

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

Answer: (D)

Liquid fuel leaks are most directly checked where fuel is filtered before reaching the engine. The fuel filter sits in the fuel line and has a housing and fittings that can develop leaks if seals wear or clamps loosen. If that happens, liquid gasoline can seep out around the filter, leaving wet spots, staining, or drips at the filter area. This is distinct from evaporative system components, which deal with fuel vapors; leaks there would show as vapor odors or faint vapor leaks rather than pooling liquid fuel. So focusing on the fuel filter makes sense because it is the fixed filter element in the line that can produce a liquid leak when its housing or connections fail.