Fuel tank for automobiles

In a tank for a liquid subjected to acceleration forces, such as a fuel tank for automobiles, having an opening therein and a back-up tank affixed to the bottom of said tank, said back-up tank surrounding the opening of a suction line for said liquid, said back-up tank being provided with admission ports, flap means which, on occurrence of acceleration forces, automatically prevents outflow of said liquid through said admission ports, and guide walls for said liquid extending upwardly from the bottom of said tank, said guide walls being arranged radiating outward from said back-up tank;

• the improvement wherein the diameter of said back-up tank is smaller than the inner diameter of said opening, a fixing ring is welded to said bottom of said tank, said fixing ring fixes the back-up tank to the bottom of said tank by a connection which can be engaged and disengaged by rotating said back-up tank, dovetail-like groove means extend upwardly from the bottom of said back-up tank and interconnect the back-up tank and the guide walls, and at least one of said guide walls projects into a vertically oriented opening in said fixing ring for the purpose of forming a safety latch against rotation of said back-up tank.