The fuel tank shut-off valve should be as close as possible to the tank, and outside the engine compartment in case it needs to be turned off in the event of a fire.
Smaller engines are usually stopped by closing the fuel cut-off valve on the injection pump via a cable, usually ending in a pull handle in the cockpit. Larger engines may use a solenoid-operated fuel cut-off valve, operated by a switch fitted in the control panel. Electrical failure of the switch, solenoid or system means that the engine cannot be stopped, so an emergency pull wire, rope or cable should be fitted.
Small engines are often stopped by simply pulling a cable attached to the fuel shut-off valve. This engine has a solenoid-activated mechanism which performs the same function but is operated by a switch on the control panel.
