Originally Posted by dnieves (Post 2335784)

How is it actually doing this (what are the mechanics behind the noise)?

Originally Posted by Alott53 (Post 2335790)

I believe it's a pump located in the fuel tank that increases pressure within the tank and checks for loss in PSI but I could be wrong. There are no statements stating what mechanics are at work in the manual.

Originally Posted by Alott53 (Post 2335771)

A lot of fellow friends of mine have wondered what the strange noise that occurs under the car near the gas tank after hours of no use. To clear things up they should go read the users manual.

Originally Posted by mav1178 (Post 2336295)

I fixed it for you. And could've saved you time.

-alex

Originally Posted by Alott53 (Post 2336820)

A lot of people don't know what to look for in terms of what it sounds like so I decided to make a video showing it.

Originally Posted by mav1178 (Post 2336838)

Originally Posted by Alott53 (Post 2336947)

Words cannot appropriately depict sound.

Originally Posted by mav1178 (Post 2337220)

This is pretty much a norm on many, many new cars, including my 2014 CT200h for starters. Just because it's unique and "strange" on your car doesn't mean it is not uncommon.

It is the evap purge valve operating and is very very common across the vast majority of new cars on the road. A lot of Owner's Manuals will state this.

BTW, it is not "self checking for leaks". It is actually purging the charcoal canister.

-alex

Originally Posted by Tcoat (Post 2337228)

From the manual:
Noise from under vehicle after turning off the engine
Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. This is the sound of a fuel evaporation leakage check and, it does not indicate a malfunction.