To prevent fuel vapor from escaping into the atmosphere, cars are equipped with an evaporative emissions system (EVAP) that collects it in a charcoal canister and keeps it there until the vehicle reaches normal operating temperature when it is drawn into the intake manifold. If your EVAP system isn’t working correctly, you’ll need to have it replaced before you can pass emissions testing. To find out if your EVAP system needs replacing, look for these warning signs of EVAP system failure.
Gasoline Smell in Cabin
One of the most common signs that your car’s EVAP system is failing is when you notice a gasoline smell in the cabin. This is usually caused by a small leak in the system that allows gas fumes to escape and enter the cabin. If you notice this, it’s essential to take your car to a mechanic to have it checked out as soon as possible.
Hard Starting
If your car has difficulty starting, especially in cold weather, it could indicate that the EVAP system is not functioning correctly. The system is responsible for sealing the fuel system and keeping fuel vapors from escaping into the atmosphere. If it’s not working correctly, those vapors can leak into the engine, making it difficult to start.
Unexpected Stalling
A most common and noticeable symptom of a failing EVAP system is when your car unexpectedly stalls. This can happen while driving, idling, or even starting your car. If your vehicle has been stalling, it’s possibly due to a problem with the EVAP system.
Excessive Emissions
If your car releases excessive emissions, it could be a sign that the EVAP system is failing. The EVAP system is responsible for preventing fuel vapors from escaping into the atmosphere. If it’s not working correctly, those vapors will be released. Excessive emissions can also be caused by a leaking gas cap or a hole in the vapor canister. If you notice your car emitting more fumes than usual, have it checked out by a mechanic to see if the EVAP system is to blame.
Strange Engine Noise
If you hear strange noises from your engine, it could be a sign that your car’s EVAP system is failing. The system is responsible for capturing and recycling fuel vapors, so if it’s not working correctly, those vapors can escape and cause all sorts of problems, including excessive engine noise.
Your car’s EVAP system is a critical part of your car’s emission system. If it’s malfunctioning, your car’s performance will suffer. See your trusted mechanic if your suspect your car’s EVAP system is failing.