I smell gas when I go close to my furnace

My furnace and hot water tank are located right next to my washer and dryer. As I was downstairs king laundry I noticed a very faint smell of gas but only right next to the furnace and hot water tank, I cannot smell it anywhere else in the house.

Has anyone ever had this? Should I be concerned? And when I say faint I mean it’s very faint like you have to go right up to the thing to smell it. But since I’m such a stress case I’m obviously a little worried.