2003 Escape 3.0L V6 149,000 miles 4x4. Three weeks ago a very strong fuel smell coming from rear of vehicle after I park it. Don't smell it anywhere else. Replaced the original fuel cap with after market. Smell stopped for a couple of days, then smell came back. Vapor smell so strong, have to leave overhead garage door open for hours or smell gets into the house. Fuel mileage is still good and idle is still smooth with no loss of power during acceleration. Looking for answers please.