Method for reducing the fuel pressure in a non-return fuel supply system

A control arrangement of an internal combustion engine having a return-free fuel supply system wherein at least one fuel pump is arranged, the control arrangement comprising:

• means for controlling the operation of said engine in a normal mode wherein said fuel pump is supplied with fuel;
• means for receiving a control command or a sequence of pregiven control commands;
• said receiving means being so configured that said receiving means receives said control command or said sequence of pregiven control commands which can be applied from outside to said control arrangement independently of said engine;
• means for checking whether said control command or said sequence of pregiven control commands define a request of a pressure-reduction mode;
• means for switching said engine over into said pressure-reduction mode wherein said control arrangement drives or controls said fuel pump in such a manner that a desired pressure value adjusts which is reduced relative to said normal mode.