Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. Is it Safe to Drive With an EVAP Leak?

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

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...


Related questions

Q: On 2nd remanufactured Mass Air Flow sensor, & it still runs better with it disconnected. Any ideas? 1001 Dodge Colt

Hi - I would first check for problem codes (even though you are pre-OBD II), diagnostic codes can be very useful in cases like this. It sounds like you have a fuel supply issue - low fuel pressure, leaking/clogged injectors,...

Q: Drives, but doesnt shift out of first gear

Automatic transmissions are tricky. It may be the same problem again. If it is you need to look further into why the solenoid is continuing to fail. There is going to be a power supply or similar issue that is...

Q: Can a cracked evaporative canister affect my air filters?

The cabin air filter should be replaced every time you have an oil change. This keeps the air in the cab clean at all times and keeps the AC and heater working in good condition. The filters are not a...