Gas smell in the CAB of the truck?

When I first start up my vehicle and let it idle the cab starts to smell like fuel not exhaust but straight fuel. When I start driving down the road the smell goes away but if I stop at a stop light the smell comes back. I don't have any check engine lights on. And my engine seems to be running fine. Just curious what could be causing the gas smell? I looked all around my engine and didn't find any leaks. Someone mentioned it could be my injector seals and I might have to replace my fuel injectors. I see I have to take off the throttle body to look and see if it's leaking there and that seems to be a huge pain in the butt before I go through that task. Do you have any recommendations of what or where I should be checking before I take off the throttle body to check the injectors?