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Automotive
Fuel Delivery Systems

The fuel deliver system is used to deliver fuel the engines fuel injector's your car. The fuel must be delivered at the right pressure and the right quaintly.  The system uses the pump to draw fuel from the fuel tank and passing it through fuel lines, and the filter, to remove any harmful impurities from the fuel, to the fuel injector's. A constant high pressure is maintained in the fuel line by a pressure regulator.


A typical fuel delivery system includes:

  • fuel tank

  •  fuel pump

  • fuel filter

  • fuel lines

  • fuel pressure regulator

  • fuel injector's

 

  • The Fuel Tank

     Fuel Tank
    • Fuel tanks are made of corrosion-resistant steel, aluminum, or molded polyethylene plastic.
    • Fuel tanks have baffles in them to prevent fuel from splashing around inside the tank.
      • The baffles keep the fuel pickup and sending unit for the fuel gauge submerged in the fuel during acceleration and hard braking.
      • The baffles have holes or slots in them to permit the fuel to move from one end of the tank to he other.
    • Fuel tank is almost always located in the rear of the vehicle though there are some exceptions.
    • Fuel tank have a cap and inlet filler tube.
       Gas Cap
      • Filler tube caps are not vented but may have a pressure-vacuum relief valve. Though normally closed, when extreme pressure or vacuum is present, the relief valve opens.
      • Fuel tank filler cap on today's cars are threaded into the upper end of the filler pipe. They require several turns counter-clockwise to remove.
        • The long threaded area of the cap is there to allow any remaining fuel tank pressure to escape during cap removal.
        • When you tightening the cap on installation, you will hear a clicking noise. This noise tells you the cap is properly tightened and full seated.

 

  • The Fuel Pump

     Fuel Pump
    • The fuel pump is located in late model car in the fuel tank along with a strainer and float.
      • The strainer is attached to the bottom of the pump and is there to stop dirt and residue that might be in the tank from entering the pump.
      • The float is attached to a sliding contact which operates the fuel gauge. As the float moves up or down the contacts position changes, varying the signal that the fuel gage receives.

 

 

 

 

  • The Fuel Lines

     Fuel Lines
    • The fuel lines carry the fuel from the tank to the fuel filter and fuel injection assembly. 
      • Fuel lines can be made of either metal tubing, flexible nylon or synthetic rubber hose.
      • The flexible nylon or synthetic rubber hose must be able to resist gasoline. 
      • Hoses must also be nonpermeable, so gases and gas vapors cannot evaporate through the hose.

 

 

 

  • The Fuel Filter

      fuel Filter
    • The fuel filter is located in the fuel line.  This is a large, heavy duty filter to filter out small particles of dirt while still allowing the pump to supply a substantial amount of fuel to the engine.

 

 

  • The Fuel Pressure Regulator

     Fuel Pessure Regulator, Fuel Rail and Injectors
    • A pressure regulator controls fuel pressure within the system so that an exact , predetermined amount of fuel will be will be delivered to the engine.

 

 

 

  • The Fuel Injector's

     Fuel Injector
    • Fuel injector are electromagnetic devices the meters and atomize fuel so it can be sprayed in the intake manifold of the car.