The throttle thus controls the speed of the engine. Throttle: The throttle controls the amount of fuel-air mixture that enters the engine from the carburetor. Too much gasoline in the mixture makes it rich too little gas makes it lean. Pump: A fuel pump produces a vacuum that pulls the fuel from an unpressurized tank, then delivers it to the carburetor.Ĭarburetor: The carburetor has one job: to mix the correct proportion of gasoline and air for the engine. A fuel filter traps dirt and sediment from the gas before it is delivered to the carburetor. Pressurized fuel systems often have a squeeze bulb in the fuel line for building pressure.įilter: A carburetor jet has a small opening that can easily become clogged. Other tanks are non-pressurized and depend on a fuel pump to deliver fuel to the carburetor.įuel Line: Fuel is moved from the tank to the pump and/or carburetor through a fuel line. Some fuel tanks are pressurized with air to help deliver fuel to the carburetor. Four-stroke engines use a fuel-air mixture.įuel Tank: The fuel tank stores fuel in preparation for mixing by the carburetor and use by the engine. Two-stroke engines require that oil be mixed with the gasoline to lubricate internal parts. However, when sprayed as a mist and mixed with air, it is quite explosive. Gasoline: Gasoline is a combustible liquid that burns relatively slowly. The following are components of a fuel and exhaust system. They furnish the fuel for combustion and remove exhaust gases. The fuel and exhaust systems are critical to operation.
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