I had this same problem--was worse when the heater was on. My mechanic thought at first it was an exhaust issue, but his fix didn't solve the problem. We finally figured out two weeks ago it came from the fuel pressure regulator. Cost about $88 and 45 minutes to fix. Now it's all dandy :)
I had intermittent fuel odor at startups most morning cold startup or after setting 2+ hours.
I replaced the the fuel line pulse damper that is conneted at the end of the fuel injectors rail bu 2 bolts. It cost me $25 for the part at advanced auto parts store and about 20 minutes most of which was learning how to diconnect from fuel line - duh. See Report #5 for cost at a repair shop.
Same issue as others on this thread. Just bought the car, so don't know how long it's been going on. Fuel smell only in morning when starting - seems to be coming in through the vents. I plan on trying to find leak in fuel pressure regulator or fuel line pulse damper as others have stated and fixing it.
In the morning when I would start my car the smell of fuel was so bad it would burn my eyes. I took it to a mechanic and he could not find the problem. I took it to Kia and they claim this is not a common problem. My car still smells like gas when it starts and faintly at times when driving. This has to be some kind of safety issue and it would be helpful if Kia came forth with information as to a fix.
I had the same problem. It was a leaking fuel pressure damper, located at the end of the fuel rail on the passenger side. It would leak when the engine was cold, and the leak would stop once the engine was up to temp. The part is available at any auto parts store for $30 - $40. I replaced mine with one from the junk yard for $2.00. Problem solved.
On cold mornings there is a very strong gas odor from the engine. It blows through the vents when idling tapers off a bit when driving the highway but is intense at idle. Later in the day I don't seem to get the problem.