2003 Kia Sedona P0181 Code: Hard Starting and Strong Gas Odor - Fix and Troubleshooting

I have a 2003 Kia Sedona with 137,000 miles. The vehicle is extremely difficult to start—only cranks repeatedly before eventually starting—but once it does, there's a strong gasoline smell. I've already replaced the fuel temperature sensor and cleared the P0181 code, but the issue returned within a few days. I then replaced the fuel pump and cleared the code again, only for the problem to reappear. I took the vehicle to two different shops: the first one started it over a two-day period without any check engine light on, making diagnosis impossible. The second shop identified a pending P0116 code—'Coolant Temperature Sensor 1'—but stated this was unlikely to be directly causing the P0181 issue. I have now replaced the coolant temperature sensor with an original Kia part. After nearly two days of operation, the vehicle starts consistently without any issues. While I'm not 100% certain it's fully resolved yet, the symptoms have significantly improved. The potential causes for P0181 (Fuel Temperature Sensor/Composition) include: - A faulty ambient temperature sensor (A) - Defective fuel temperature/composition sensor - Faulty intake air temperature sensor - Open, shorted, or damaged wiring or connectors to the PCM - PCM programming error I recommend verifying the circuit integrity from the temperature sensors and checking wiring harnesses. For detailed troubleshooting, refer to this forum thread or resources like BBBind.com for official wiring diagrams. Help is still appreciated—any additional insights on P0181 in 2003 Kia Sedona models would be greatly valued.