A capless fuel door assembly including a body pivotally supported within a housing of the vehicle between closed and opened positions. The body includes an exterior projection exhibiting an angled slide. A spring is secured to the housing and includes an extended portion supported against an end stop location of the projection defining a first end of said angled slide in order to exert the body in the closed position, with opening of the body about the pivot causing a decrease in the closing force as the spring portion displaces along said angled slide to a second end to achieve the opened position.