ASE A1 Engine RepairFuel, Emissions, and Ignition Systems (General)Easy
A vehicle owner reports a strong smell of gasoline coming from their vehicle, particularly after driving. Upon inspection, the technician notices a small amount of liquid fuel on the ground under the vehicle, near the fuel tank area. Which of the following is the most likely cause?
- AClogged fuel filter
- BStuck open PCV valve
- CLeaking fuel line or hose
- DFaulty mass air flow (MAF) sensor
Show answer & explanationAnswer & explanation
Correct answer: C. Leaking fuel line or hose
A strong smell of gasoline and visible fuel on the ground are direct indicators of a fuel leak. Leaking fuel lines or hoses are a common source of such external leaks, especially in the vicinity of the fuel tank where these components are prevalent.
Why the other options are wrong
- A. A clogged fuel filter would restrict fuel flow, causing performance issues, but not a fuel leak.
- B. A stuck open PCV valve can cause engine performance issues or oil consumption, but not an external fuel leak.
- D. A faulty MAF sensor affects air/fuel mixture, causing engine performance issues, not external fuel leaks.
External Fuel Leak
Any situation where liquid fuel escapes from the vehicle's fuel system and is visible outside the system components, often leading to a strong gasoline odor and potential fire hazard.
- Indicated by visible fuel and strong odor.
- Common sources include fuel lines, hoses, and fuel tank imperfections.
- Requires immediate attention due to fire risk and environmental concerns.
Memory trick: If you smell and see the fuel, a line must have come unglued.