Fuel Composition SensorFuel Composition Sensors are used to determine the amount of ethanol alcohol in the gasoline. Normally, agasoline engine should not have more than 10% ethanol alcohol in the fuel for proper operation. Somevehicles have a flexi-fuel system on them that allow them to run on up to 85% ethanol alcohol in the fuel.The fuel composition sensor sends a frequency modulated signal to the engine controller which isproportional to the alcohol content of the fuel. The injector pulse width and the ignition timing are modified
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