Kia 2001 Sportage 5-door 4x4 - Fuel leakage

I have owned and have been driving this model for over 10 years now. I recently had the engine overhauled, and I have been driving it for over 2 weeks now. I go to the gas station every 2 weeks to refuel, and when I do, I make sure I refuel the whole full tank. However, just after refueling the full tank, I noticed drips or leakage for about 30 seconds or so and then stopped. I am wondering if it is an overflow, discharge, or something to worry about.