Abstract: An engine interlock control system is disclosed which is particularly suited for use with a material handling implement comprising a combination loader backhoe. In the preferred form, the present control system includes an electrically-operated fuel solenoid for selectively controlling delivery of fuel to the internal combustion engine of the implement. This system further includes means for sensing operation of the engine, preferably comprising an oil pressure sensor, and means for sensing disposition of the implement's transmission in a neutral condition. The fuel solenoid, engine sensor, and transmission sensor are all operatively connected with a microprocessor control unit, whereby delivery of fuel to the engine is prevented in the event that the engine is not running, and the transmission is in a non-neutral condition.