Abstract: A system for automatically regulating the fuel supplied to the engine of a mobile construction machine which has a hydraulic pump driven by the engine. A tool is carried by the machine for performing work functions and hydraulic cylinders are provided for manipulating the tool responsive to pressurized fluid being supplied to the hydraulic cylinders. A manually operated valve mechanism is provided for controlling the flow of hydraulic fluid between the hydraulic pump and the hydraulic cylinders. A lever arm regulates the flow of fuel to the engine. The lever arm can be manually manipulated or it can be manipulated automatically by means of a double action cylinder. A piston rod extending from the double action cylinder is connected to the lever arm so that the fuel supplied to the engine is regulated responsive to changes in pressure in the hydraulic system.