A driver recently noticed that her garage had begun to smell like gasoline after she parked her vehicle inside. Her Check Engine light had also just come on. This was something she’d never experienced before. So, she called up her NAPA Service Advisor and asked what was causing it.

The answer, of course, is that many things can cause a sitting vehicle to smell like gasoline fumes. But it can sometimes be tricky to track down the source, so here are a few things you can look for that may help your NAPA AutoCare Center technician pinpoint the origin of the odor.

Gasoline odors can be caused by a leak somewhere in the fuel system, meaning gasoline can be dripping out. Some possibilities? It could be a break in a fuel line. You could have a leaky fuel-injection line or injector. There’s a vent for your fuel tank that may also leak. The fuel filler neck can wear out and fail. One thing you should look for is to see if there are any puddles of gasoline on the floor of your garage. Any time there is gasoline sitting around, it can be dangerous. Fumes can be a health hazard, and you know gasoline can catch fire if exposed to a flame or spark.

A couple of other causes of gas smells? Your vehicle may have a charcoal canister that stores excess fuel vapor. You may smell a strong gasoline odor if it cracks or its seal is damaged. This may also cause your Check Engine light to come on. And don’t rule out something as obvious as your gas cap. It may be loose or worn out, so it doesn’t seal the fumes in. A leaky, loose, or missing gas cap may also cause the Check Engine light to come on.

Whatever the cause, if your garage has started to smell strongly of gasoline, call your NAPA AutoCare Center before you attempt to start the vehicle. The fire risk is high, so you may be advised to have your vehicle towed to the service center. Gasoline is the source of your engine’s power. If that power is unleashed uncontrolled, it could hurt or kill you or others around you.