is connected to the solenoid 52 the fuel shutdown control circuit on board 46 closes the relay 48 in response to the detection of conditions representing engine turn off when the ignition switch 4 is in its on position the engine ignition controller 42 provides ignition pulses to the engine 8 ignition pulse signals are also received by the fuel shutdown control board 46 on line 44 in response to detecting that ignition pulses are not present the fuel shutdown control board 46 activates the fuel cutoff solenoid 52 thereby cutting off the supply of fuel to the engine 8 the circuitry for performing the fuel shutdown control function may be analog or digital in one example of an analog circuit comparators are used to control the on state of a fuel cutoff transistor as a function of the incoming pulses on line 44 as long as ignition pulses are present the fuel cutoff transistor is maintained in the on state the state of the relay 48 is a function of the state of the fuel cutoff transistor when the fuel cutoff transistor is on the relay is held open when ignition pulses are no longer present the transistor turns off causing the relay 48 to close thereby energizing the fuel cutoff solenoid 52 alternatively the fuel shutdown control board could be provided with a microprocessor or a microcontroller that is programmed to issue a command that causes the relay 48 to be closed in response to detection of the above described condition on line 44 the details of the algorithm performed by the fuel shutdown controller are presented in fig3 after the engine has been started the fuel shutdown controller monitors line 44 see fig2.