2002 Chevy Trailblazer GASOLINE SMELL

Smells problem
2002 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic 120000 miles

THERE IS VERY SLITE GASOLINE SMELL ON LEFT SIDE SOMEWHERE. HERE ALMOST DO NOT SMELL IT HOWEVER, AGAIN YOU DO. SHOULD I DO THE FOLOWING:
1. CHECK FOR SLITELY BROKEN GAS LINE?
CKECK GASOLINE FILTER LEAKING AT CONNECTIONS?
OR IS THERE SOMETHING ELSE I SHOLD BE LOOKEN AT? THANK YOU VERY MUCH. CHUCK