2005 ford expedition gas smell on start up and sometimes at idle no leak detected on fuel rails or spots on ground?

Engine on

Clear 3/8 hose

Clean nose

Put the hose on the spark plug and Then smell one by one

If you find one

Take it out and then you see the bottom of the spark plug

It's not even

Put new one or use the old one make sure it's clean and tight

DOS how I find out

rdrmiguel1975@aol.com