My friend had a simlar problem on his 2000 4.8 Chevy truck.
He found that the fuel pressure regulator was leaking internally.
Changed it & the smell went away plug got better gas mileage.
I have a simular problem w/my 1997 Chevy 5.7 350.
Every once in a while I smell fuel just after I drive it & get out of the truck, I smell fuel,I don't see any leaks but I smell fuel.
I might have a bad fuel pressure regulator also???
MBHD
