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Energy and Power 3201

Energy and Power 3201. Fuel Systems. Overview. What are the major components of the fuel system? How do they function together? Breaking the components into their parts. Troubleshooting the fuel system. Fuel Tank. Stores fuel for the engine… Older ones are made of steel or aluminum

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Energy and Power 3201

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  1. Energy and Power 3201 Fuel Systems

  2. Overview • What are the major components of the fuel system? • How do they function together? • Breaking the components into their parts. • Troubleshooting the fuel system.

  3. Fuel Tank • Stores fuel for the engine… • Older ones are made of steel or aluminum • What is our made of? … Plastic. • Follow the fuel from here…where does it go?

  4. Fuel Line • There is a hose connected to one side of your tank. • This is the Fuel Line that carries fuel from the tank to the carburetor. • How does fuel move in this line? What force makes the fuel move from the tank to the carburetor?

  5. On most engines, the force of gravity carries the fuel through the fuel line. However, if the fuel tank is mounted low on the engine, gravity may not do the trick. • In this case, a fuel pump uses low pressure in the crankcase to pump fuel. The pump is located between the tank and the carburetor or in the carburetor itself.

  6. Some engines eliminate the need for either a fuel line or pump by mounting the carburetor directly on the fuel tank and using a pick-up tube in the tank to draw fuel.

  7. Into the Carburetor • On our engine, fuel from the fuel line enters the carburetor's fuel bowl, a reservoir where a float, similar to the float ball in a toilet tank, regulates the fuel level. • From there, a metering device called a jet lets fuel into the emulsion tube inside the pedestal, where fuel and air first mix.

  8. Older models include an adjustable jet; newer models contain a fixed jet. • Fuel travels through the emulsion tube to the main passageway in the carburetor, called the throat or venturi, where further mixing occurs.

  9. Throttle • At one end of the throat is a throttle plate. • The throttle plate is connected to your equipment control lever (often referred to as the throttle) and opens or closes to increase or decrease engine speed. • As the throttle plate opens, more air is drawn into the carburetor. Air flow, in turn, determines how much fuel is delivered for combustion

  10. Choke • A throttle works fine in warm weather. But when it's cold, fluids don't vaporize as easily. The engine may need extra fuel to start. • This is the role of the choke plate or primer. They compensate for the cold by increasing the fuel-to-air ratio. The choke is located in the throat between the air filter and the throttle plate.

  11. Closing the choke reduces air flow. Low pressure created inside the engine keeps the fuel flowing. The use of the choke "enriches the mixture.” • It's not an effective way to run an engine all the time, but it helps a cold engine start. Once the engine reaches its normal operating temperature range, you can open the choke to let in more air, for a cleaner, more efficient burn.

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