If you're concerned about a fuel leak, do not attempt to find or manipulate anything under the hood related to the fuel system yourself. Fuel is extremely flammable, and working with it without proper training and equipment is extremely dangerous.
Instead, if you suspect a fuel leak or have a fuel-related emergency:
* Turn off the vehicle immediately.
* Evacuate the vehicle and move to a safe distance.
* Call emergency services (911 or your local equivalent).
* Do not attempt to repair the leak yourself.
A mechanic will have the proper tools and knowledge to diagnose and repair any fuel system issues.