1998 Renault Scenic Air-Fuel Mix

Engine Mechanical problem
1998 Renault Scenic 4 cyl Two Wheel Drive Manual

Can you tell me if the air mixture screw is situated underneath the air filter or is it on the carburettor? When I start it up there is a strong smell of petrol and when I go up hill it does the same, is this to do with the air fuel mix or is it something else? Thank you, Chirs