94 check engine light/smell of gas

A friend of mine has a 94 88 delta and is having this problem. If you guys could give directions on how to check for codes and what could possibly be wrong with it. If this was a ford I could handle it but I know nothing about the olds.

Thanks a lot for any help.

Message me if you want to.

walmart has a 30 dollar reader quick and easy for moduals 94 and lower just plug it in put the car in the run position and the check engine light will blink

We got it scanned it wasn't nothing to worry about.

Thank you for the reply though!