All of a sudden my car won't start. Engine cranks but it wont start. I can't on 2001 Saturn LW300

smell gas. After sitting all night and adding gas additive and much trying it finally started up. Any idea what could be wrong. After starting up service engine soon light came on and stayed on. Thanks Marilyn

Asked by for the 2001 Saturn LW300
scan codes and ck fuel pressure
I took it to dealership. I hope they don't find anything expensive. Thanks for your answer. Marilyn
Hope they check the plugs for fouling.