Abstract: A fillable tank is disclosed, which tank is adapted to cooperate with a filler pipe for conveying material into the tank. The tank comprises a tank wall and a filler pipe seat defining an opening through the tank wall, which opening is adapted to receive the filler pipe. The filler pipe seat comprises a frustro-conical shoulder to improve the retention of the filler pipe in the tank against pull-out forces. The smaller diameter end of the shoulder is inward of the larger diameter end which latter is integral with the tank wall. The frusto-conical shoulder comprises integral reinforcement ribs extending substantially longitudinally on the surface thereof. Optionally, the small diameter end of the shoulder may provide a radial surface adapted to bear against a radially outward extending annular bearing surface of the filler pipe to prevent pull-out of such filler pipe from the tank.

Abstract: A motor vehicle fuel tank is disclosed, having a fluid pressure thermoformed tank wall comprising a bottom wall and opposed side walls unitary with and extending upwardly from the bottom wall. The fuel tank is characterized in that it has a fuel reservoir unitary with the tank wall and, specifically, formed by convolutions in the bottom wall of the tank. The fuel reservoir comprises two opposed substantially C-shaped ridges extending upwardly into the tank from the plane of the bottom wall, each such ridge extending from a corresponding one of the side walls toward the opposed side wall to a second end, diminishing in height to approximnately the plane of the bottom wall at such second end. The two C-shaped ridges cooperate to partially surround a portion of the surface area of the bottom wall of the fuel tank. A channel between each ridge and the end of the other ridge permits fuel to flow into the fuel reservoir even during low fuel conditions.

Abstract: A motor vehicle fuel tank is disclosed, having a fluid pressure thermoformed tank wall comprising a bottom wall and opposed side walls unitary with and extending upwardly from the bottom wall. The fuel tank is characterized in that it has a fuel reservoir unitary with the tank wall and, specifically, formed by convolutions in the bottom wall of the tank. The fuel reservoir comprises two opposed substantially C-shaped ridges extending upwardly into the tank from the plane of the bottom wall, each such ridge extending from a corresponding one of the side walls toward the opposed side wall to a second end, diminishing in height to approximately the plane of the bottom wall at such second end. The two C-shaped ridges cooperate to partially surround a portion of the surface area of the bottom wall of the fuel tank. A channel between each ridge and the end of the other ridge permits fuel to flow into the fuel reservoir even during low fuel conditions.