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Ignition Systems

Fuel Systems 2 . Ignition Systems . Objectives. Understand Fuel Lines and tanks Understand Fuel Pumps and filters . Fuel Tanks . Used to store fuel Made of plastic or steel Newer engines made of plastic Fuel Caps Vented to prevent a vacuum in the tank

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Ignition Systems

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  1. Fuel Systems 2 Ignition Systems

  2. Objectives • Understand Fuel Lines and tanks • Understand Fuel Pumps and filters

  3. Fuel Tanks • Used to store fuel • Made of plastic or steel • Newer engines made of plastic • Fuel Caps • Vented to prevent a vacuum in the tank • Vacuums prevent engine operation • Caps also have a set of thin plates called baffles to prevent dust and particles from entering the tank

  4. Fuel Tanks • Fuel Strainer • Located in the tank to prevent contaminates during fueling • Fuel Fittings • Connects fuel lines to system parts • Outlet Filter Screen • Screens particles as fuel leaves the tank • Shut off Valve • Closes fuel tank outlet • Fuel Lines • Made of metal, synthetic rubber or flexible nylon

  5. Fuel Filters • Unclean fuel can clog the carburetor preventing operation • Water in the fuel line can cause detonation • Fuel filter are used to remove any impurities of fuel • Most newer filters are disposable and have paper filament to catch impurities

  6. Fuel Pumps • Most fuel systems use a gravity fed system to pull the fuel to the carburetor • Fuel Pump • A pump that creates a low pressure to move fuel to the carburetor

  7. Mechanical Fuel Pump • Pumps using a lobe on the camshaft to pump the fuel out • The lobe moves a rocker arm up and down that serves as a pump • Like a plunger

  8. Impulse Fuel Pump • Utilizes Pressure impulses in the intake manifold • Intake manifold • Part that delivers the air-fuel mixture form the carburetor to the intake port

  9. Primer • A bulb used to force fuel into the air entering the combustion chamber • Used to start a cold engine • Has not ran for several hours

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