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Dumb guy mechanical fuel pump ?

Discussion in 'Street/strip 400/430/455' started by Stagedcoach71, Dec 5, 2003.

  1. Stagedcoach71

    Stagedcoach71 Well-Known Member

    Hold on to your hats, its time for the dumb question of the day.


    I liken the arm on a mechanical fuel pump to that of an old timey well pump. The arm goes up and down and liquid is forced out.

    What is going on inside a mechanical fuel pump that allows only the correct amount of fuel to make it in the carb? If the float says no more, what retards the fuel supply?

    Thanks for your patience.

    :beer
     
    Stagedcoach71, Dec 5, 2003
    #1
  2. Truzi

    Truzi Perpetual Student

    Let me guess:

    Its just a diaphram inside, probably rubber. My guess is the volume of gas pumped is constant, governed by the size of the chamber/diaphram in the pump. The faster the cam turns, the faster it pumps.

    The float in the carb would cut off the fuel supply - so the fuel being pumped would find the path of least resistance through the return line between pump and gas tank. I think of the return line as similar to the over-flow on a kitchen sink.

    I suppose the size of the needle valve itself makes sure only so much fuel enters the carb per second, so the return line is probably always in use to some degree.

    Of course a technical answer would be cool.
     
    Truzi, Dec 5, 2003
    #2
  3. joejbal

    joejbal Well-Known Member

    they dont all have return lines do they?
     
    joejbal, Dec 5, 2003
    #3
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Here you go guys,
    This page out of my 70 Chassis manual should explain everything.
     

    Attached Files:

    LARRY70GS, Dec 5, 2003
    #4
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    here's the last paragraph.
     

    Attached Files:

    LARRY70GS, Dec 5, 2003
    #5

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