an impact sensitive fuel supply control system comprising a fuel cell and a fuel line connecting said fuel cell to an engine , an electromechanically activated valve connected to said fuel line , a fuel pump located proximate to said engine , an impact sensative mechanical limit switch coupled to a limit switch locator mounted on or adjacent to said fuel pump , said electromechanically activated valve and said impact sensative mechanical limit switch in series in an electrical circuit which is interrupted when said switch and said limit switch locator are dislocated .