How do I fill up my car with a capless gas tank?

The 2017 Jeep Wrangler Chief Edition.
The 2017 Jeep Wrangler Chief Edition. –Jeep

My 2017 Jeep Wrangler has a capless gas tank. Why was the gas tank designed this way?

Q. I ran out of gas in my 2017 Jeep Wrangler, and I was (fortunately) within walking distance of home. I got my gas can, walked back to my Jeep, and found that I couldn’t get the spout into the capless gas tank. I was able to very slowly get enough gas in the tank to get the engine running and drive to the gas station. Why was the gas tank designed this way?

A. Several manufacturers are using a cap-less fuel system, which makes filling easier while preventing fumes from escaping into the air. Somewhere in your vehicle, there is a small funnel that, when pushed into the gas tank, will release the flap, allowing you to add fuel with a gas can.


John Paul is AAA Northeast’s Car Doctor. He has over 40 years of experience in the automotive business and is an ASE certified master technician. Email your car question to

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