Skip the auto shop - Our mechanics make house calls

Is it Safe to Drive With an EVAP Leak?

EVAP Leak

An EVAP leak is a fault in the evaporative emission control system (EVAP). The EVAP’s function is to keep gasoline fumes in the fuel tank from reaching the atmosphere. This keeps air pollution down, and keeps the smell of fuel from reaching the inside of your vehicle. Some symptoms that will let you know that there is an issue with the EVAP system:

  • One symptom of an EVAP leak is the Check Engine Light coming on while you are driving. A slight fuel odor may also be noticed, but it does not happen in all vehicles. If your Check Engine Light does come on, and you just filled up your gas tank, check the gas cap to see if it's loose.

  • The most common cause of an EVAP leak warning, or the Check Engine Light, is the gas cap not being closed properly. If the cap is not fully tightened or closed all the way, the Check Engine Light may come on. Before taking your vehicle to a mechanic, check your gas cap to make sure it is positioned on the filler correctly and closed tightly.

  • If the gas cap is on correctly, there may be a more serious issue, such as a leak in the fuel system. Other issues could be a faulty vent o-ring seal, defective leak detection pump, defective purge valve, or another small leak somewhere in the EVAP system.

  • Fuel vapors emit from the vehicle any time there is gasoline in the tank. So if you have a leak, even if you are not driving the vehicle, those vapors are polluting the air 24 hours a day. Uncontrolled emissions like this account for about 20 percent of the pollution produced by vehicles.

  • If your Check Engine Light comes on and you suspect a leak in your EVAP system, it is best to have a mechanic inspect the vehicle. EVAP problems can be challenging and the mechanic will have to use advanced troubleshooting techniques to determine where the leak is, as well as how severe it is.

While it is safe to drive with an EVAP leak, you should get the leak repaired right away. If your Check Engine Light comes on, check to make sure the gas cap on your vehicle is securely fastened. If that doesn't solve the problem, contact a certified mobile technician from YourMechanic to inspect the EVAP system. It takes a professional to troubleshoot and repair an EVAP leak.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...


Related questions

Q: Truck missing badly

Hello, as with all fuel injected vehicles, the first thing to check is to connect a scanner and check for codes and data. Diagnosing a miss is more that just the fuel system. If there are no codes, the cylinder...

Q: Power steering fluid leaking in a 2006 Jeep Liberty

Power steering fluid can leak from multiple different places such as; the main power steering pump seal, behind the power steering pump pulley, the pressure line going from the front of the pump to the steering rack, or the return...

Q: I cannot locate the solenoid vent valve in my car.

Hi there. The purge control valve that you are looking for is located next to the valve cover and between the engine and the firewall to the front of the engine area. The valve should have vacuum type hoses attached...