Leaking injector or regulator?

[cyberstang5.0]

The fuel pressure is suppose to drop down to zero when you shut the car down. It is just equalizing the pressure within the system. As far as the smell of fuel goes, it might be your exhaust. When my car was running rich, I was able to smell the unbunt gas. I also don't have cats to burn up the extra fuel. Check to see if your running too rich, that might solve your problem...