Abstract: The invention relates to a float (5) for a fill level sensor, comprised of a fuel-resistant plastic (7), an expanding means (8) and/or filler (9), whereby the expanding means consists of gas-filled plastic balls (11) that are provided in the form of microspheres (8), and the filler consists of micro-hollow balls (9). The microspheres (8) and the micro-hollow balls (9) are surrounded by fuel-resistant plastic (7).

Abstract: The invention relates to a float (5) for a fill level sensor, comprised of a fuel-resistant plastic (7), an expanding means (8) and/or filler (9), whereby the expanding means consists of gas-filled plastic balls (11) that are provided in the form of microspheres (8), and the filler consists of micro-hollow balls (9). The microspheres (8) and the micro-hollow balls (9) are surrounded by fuel-resistant plastic (7).

Abstract: In a fuel tank (1) for a motor vehicle, a cap (4) which closes off an installation opening (3) has a metal insert (11). The metal insert (11) has a pressure-exerting surface (13) which faces toward an edge (9) which laterally delimits the installation opening (3). This construction prevents settling of the material, which in the long term leads to leaks from the fuel tank (1).

Abstract: A fuel tank for a motor vehicle comprising a wall composed of two shells arranged one above the other. The outer shell of the wall preferably has an inlet orifice and an outlet orifice. A filter element is arranged in front of the outlet orifice. Scavenging air from the inlet orifice thereby passes first into a gap between the shells and subsequently to a filter element. As a result, fuel vapors can no longer diffuse through the wall and pollute the environment.

Abstract: In a fuel tank (1) for a motor vehicle, a cap (4) which closes off an installation opening (3) has a metal insert (11). The metal insert (11) has a pressure-exerting surface (13) which faces toward an edge (9) which laterally delimits the installation opening (3). This construction prevents settling of the material, which in the long term leads to leaks from the fuel tank (1).

Abstract: A fuel tank for a motor vehicle, having a wall (3) which is manufactured from plastic, in particular by injection molding, is provided on its inside with a permeation barrier (4). The permeation barrier (4) is manufactured from a material which is virtually impenetrable for fuel vapors. The permeation barrier (4) is composed of shell parts (5, 6) which are welded to one another.

Abstract: In a method of producing a fuel tank from plastic, a heating element is located between two shell parts to be welded to one another. When the shell parts are pressed together, the heating element melts into the plastic and produces a weld that provides a fuel-resistant seal. The fuel tank subsequently has a particularly exact shape.

Abstract: A fuel tank for a motor vehicle comprising a wall composed of two shells arranged one above the other. The outer shell of the wall preferably has an inlet orifice and an outlet orifice. A filter element is arranged in front of the outlet orifice. Scavenging air from the inlet orifice thereby passes first into a gap between the shells and subsequently to a filter element. As a result, fuel vapors can no longer diffuse through the wall and pollute the environment.

Abstract: The invention relates to a process for reducing the residual hydrogen fluoride gases in a fluorinated plastic tank, in particular in a plastic tank for a motor vehicle, in which firstly the space within the tank is subjected to a fluorination step and then, in at least one gas flushing process, the reaction products of the fluorination step are removed from the plastic tank. In a process in which the undesired reaction product hydrogen fluoride is completely eliminated and which is suitable for efficient large-scale production, after the gas flushing process, a neutralization step is carried out to bind residual fluorination gases on the inner layers of the plastic tank.