Glossary / Engine

gas cap

11 Episode Mentions

Too Afraid to Ask

The gas cap is a small cover you put on the top of your car’s fuel tank. It keeps dirt out and helps the engine run smoothly by keeping the right amount of pressure inside.

Technical Definition

A gas cap is a seal that covers the fuel tank opening to prevent contaminants from entering and to maintain proper pressure for the vehicle’s fuel system.

Hear It Discussed

"and you open the gas cap and the smoke pours out. So I know it had built pressure."
Can The 911 GT3 S/C Be A Real GT3? — The Carmudgeon Show w/ Jason Cammisa & Derek Tam-Scott — Ep 234 The Carmudgeon Show 12:27

"For decades, pulling up to a gas station meant unlocking the fuel door, twisting off a cap, setting it aside, and filling up."
Southeast Texas Driving Destinations In Wheel Time Podcast: Your Go-To Automotive Talk Show 10:50

"right but if the kid at the gas station left the gas cap loose it's never going to build pressure right"
Ron Ananian, The Car Doctor - December 20, 2025 - Hour 2 - The Night Before Christmas (855)560-9900 Ron Ananian The Car Doctor 45:41