2002 Buick Century fuel odor

Are you loosing radiator fluid. sometimes the heater core will rupture and you will smell burn odor. also check for strange rubbing sounds or screeching coming from the blower fan motor. or engine exhaust manifolds are hot when car is on, make sure nothing is leaning on them which will cause a burn odor. Any odor coming from outside will find it's way inside through the fresh air vents.

blower resistor is common to burn causeing smell. check with dealer, there may be a campain on this problem. if not. replace resistor and harness (pig tail) and blower motor..

Check the fuel pressure regulator.Pull the vacuum hose off of the fuel regulator and check for fuel inside hose.If you find fuel replace regulator.Also check map sensor for fuel.

check fuel pressure regulator to ensure fuel is NOT present in the vacuum hose

look for loose conectors in the blower assembly or trash inside the intake duct from outside especialy around the fan resistors.

The smell indicates a leaking fuel line, so check this ouit asap.

I have a 2002 Impala, and on cold days on the first start of the day had strong fuel smell. I troubleshot the problem to the fuel pressure regulator on the fuel rail was leaking around the seams. I replaced the regulator and have had no problems since. Hope this helps.
Chad

Get the TPS checked out for it may not be adjusted correctly.

THE CARBON CANISTER IS MOST LIKELY OVERLOADED, REPLACE THE CARBON CANISTER VAPOR TRAP, IT IS NEAR THE FUEL TANK.

I recently had the same problem. It turned out that the fuel regulator on the engine at the left side just above the intake manifold had an intermitent leak. The gas leaking was not always visible so I had the regulator changed and that solved the problem.