I smell gas in my 99 Buick Lesabre while im driving

the check light has no connection to the fuel delivery,

Just a suggestion.... My wifes Buick Rendezvous had the same problem when the defroster would be on for awhile. It went away for awhile but the odor returned last week. I noticed the Fuel Pressure Regulator was leaking. Its on the top of the engine where the fuel rail is. Its only held in by 1 bolt w/ and o-ring to seal. I loosened the screw and wiggled/jiggled the part then retighten the bolt. So far so good

One place to check for a gas smell is the fuel injector O-rings. There's an O-ring where the injectors mount into the intake manifold and an O-ring where the injectors mount into the fuel rails. If any of these O-rings are leaking and the slightest amount of gas lands on the hot intake manifold it turns into a vapor. And this gas vapor can be drawn into intake of the ventilation system and you get a gas odor inside the vehicle.

But the real guess is fuel pressure regulator.... my fuel pressure regulator was dying. This was the source of the fuel fumes. The smell was worst when the car had just started because the fuel would leak most when the car is first turned on, then stop. The fuel would quickly evaporate from the engine block, and the only evidence it had happened when I would check after a long drive would be the grime in that area of the engine

Could that cause a car not to start but still smell the gas?

some good answers here, but the bottom line is, NO you can not drive it because there is a danger of fire-

When I start my car there is a gas smell in the front of my car I have a 99 Buick lasabra u can't put it in while it's running where do I check it out at