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Fuel Systems

Fuel Systems. Components. Tank Filler cap Fuel lines Fuel filter Fuel pump Carburetor Fuel injection system. Fuel Tank. Materials Stamped steel Aluminum Polyethylene plastic Baffles Filler tube Unleaded has small hole Leaded has large hole Sending unit Vent Rollover checkvalve.

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Fuel Systems

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  1. Fuel Systems

  2. Components • Tank • Filler cap • Fuel lines • Fuel filter • Fuel pump • Carburetor • Fuel injection system

  3. Fuel Tank • Materials • Stamped steel • Aluminum • Polyethylene plastic • Baffles • Filler tube • Unleaded has small hole • Leaded has large hole • Sending unit • Vent • Rollover checkvalve

  4. Carbon Canister • Fuel vapors are vented into the carbon canister which contains active charcoal • Active charcoal absorbs the hydrocarbons and prevents them from evaporating into the atmosphere • During closed loop cruise conditions the carbon canister purge valve is commanded open by the computer • This pull the hydrocarbons into the engine where they are burnt • Raw fuel will saturate and destroy a charcoal canister • Capacity – 50 grams vapor (equal to 2-3 oz. liquid gasoline)

  5. ECM Purge Valve Engine Vent Fuel Tank Charcoal Canister

  6. Fuel Tank Sending Unit

  7. Fuel Tank Sending Unit

  8. Filler Cap • Non-venting • Vacuum/pressure relief valve • Torque limiting mechanism • Ratchets once pre-determined torque is reached • Three clicks • According to Sun Oil research, a missing or defective fuel cap can allow as much as 176 pounds of gasoline vapors (30 gallons) to evaporate into the atmosphere each year

  9. Fuel Lines • Materials • Steel • Aluminum • Nylon (hard plastic) • Rubber • Must be made for use with fuel • Must be made to withstand adequate pressure • Fuel injection systems may operate with pressures up to 70 PSI • Fittings • Compression • Double flare • Quick connect type

  10. Fuel Filter • Type • In-tank strainer • Made of finely woven nylon cloth • In-line • Usually used in fuel injection systems • In-carburetor • Pleated filter or sintered bronze filter located in the fuel inlet of the carburetor

  11. Fuel Pump • Mechanical • Operated off of the camshaft • Used in carbureted systems • May have a vapor return line • Electrical • Suction type • May be located anywhere between the tank and the fuel metering device • Pusher type • Mounted in fuel tank

  12. Mechanical Pump

  13. Electric Pump DO NOT run test electric fuel pumps while they are out of the tank

  14. Fuel Pressure Regulator • Used on fuel injection systems to maintain the proper fuel pressure • During high vacuum cruise conditions the regulator will maintain the fuel pressure at a lower reading • During low vacuum WOT conditions the regulator will boost fuel pressure

  15. Fuel Pressure Regulator Diaphragm Spring Manifold Vacuum Injectors Seat Pintle Fuel Pump Return Line Fuel Tank

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