What Does the Fuel Cap Warning Light Mean?

Schedule Check Fuel Cap light is on Inspection
Service Area

$79.99 - $89.99

Price range for all vehicles
Average rating from 5 customers who received a Check Fuel Cap light is on Inspection.

As you may know, your car pumps liquid gasoline from the fuel tank to the engine to be ignited by the spark plugs. Your car may also contain some gasoline that has evaporated which is then sent to the engine to be used up. The evaporated gas gets collected in a separate tank called the charcoal canister. Once certain driving conditions are met, a valve opens to the engine and the fuel vapors get mixed in with the rest of the fuel being burned.

In order for this fuel system to work properly, it needs to be sealed from the outside air so that nothing escapes. Most fuel caps have a rubber O-ring to prevent vapors escaping when the cap is secured. As you drive, your car is able to monitor the system for any possible leaks in the system and display a warning light on the dashboard if a leak is detected.

What the fuel cap indicator means

Simply put, if your fuel cap light is on, it means that the computer has detected a leak in the system, typically from a loose gas cap. If this light comes on while driving, pull over in a safe spot and re-secure the cap. Continue driving normally with the light illuminated and it should go off within a day or two. If the light doesn’t turn off, inspect the gas cap for any damage and replace it if necessary.

A leak present somewhere else in the system can also trick the computer into thinking the gas cap is leaking. If the gas cap looks okay and the light does not turn off, have a certified technician investigate the issue and determine the cause.

Is it safe to drive with the fuel cap indicator on?

The main thing you may notice if the light is on is a slight reduction in performance. With less power, your engine has to work harder to get up to speed. As a result, your gas mileage will diminish slightly. On top of that, you are likely releasing harmful gases into the environment.

Without properly working EVAP systems in every car, our quality of air would be much worse due to the hydrocarbons released from the gasoline. Maintaining your EVAP system also ensures that you are getting the most out of the fuel you buy.

Our certified technicians are always available to assist you with diagnosing any problems related to your fuel cap indicator light.


Next Step

Schedule Check Fuel Cap light is on Inspection

The most popular service booked by readers of this article is Check Fuel Cap light is on Inspection. Yourmechanic’s technicians bring the dealership to you by performing this job at your home or office 7 days a week between 7AM-9PM. We currently cover over 10k cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

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

Recent Check Fuel Cap light is on Inspection reviews

Excellent Rating


YourMechanic Check Fuel Cap light is on Inspection Service

Average Rating

5/5

Number of Reviews

5

Rating Summary
5
0
0
0
0
5
0
0
0
0

Kiri

19 years of experience
372 reviews
Kiri
19 years of experience
Mazda CX-5 - Brake Pads Replacement (Front, Rear) - Philadelphia, Pennsylvania
Efficient and got the job done, will definitely use again.
Dodge Stratus - Distributor - Philadelphia, Pennsylvania
The mechanic god, did an 3 hour job within 30 mins THANKS AGAIN!!

Keith

14 years of experience
8 reviews
Keith
14 years of experience
Mitsubishi Galant - Check Fuel Cap light is on - Dedham, Massachusetts
Keith made my initial experience with "My Mechanic" a great one. Responsive, communicative, timely, and knowledgeable...a dependable and trustworthy mechanic. The guy you wish for as your permanent, neighborhood mechanic at the garage down the street...

James

9 years of experience
21 reviews
James
9 years of experience
Kia Soul - Check Fuel Cap light is on - Atlanta, Georgia
Very helpful, he saved me a lot of frustration.

Jahmar

17 years of experience
36 reviews
Jahmar
17 years of experience
Volkswagen Jetta - Check Fuel Cap light is on - Fort Lauderdale, Florida
He found out what was exactly wrong with my car and gave me great info on what’s needed to fix it.

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