Hi guys / gals

Have noticed quite a strong fuel smell inside the car whilst driving, have lifted the bonnet but can't see anything leaking anywhere. Also noticed the smell from the exhaust smells a bit of petrol but no black smoke indicating running rich although I have noticed I now get a pop from the exhaust now and again. Is there any common place to look and how do I know if it's running rich or not.

Probably need to get this sorted soon as it's MOT is due within weeks