Knocking sound from Fuel Pump. OK or NOK?

Discussion in 'Carb/Tuning' started by ManuelSans, Apr 13, 2019.

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Is the sound normal?

  1. Normal

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  2. Not normal

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  1. Apr 13, 2019 #1

    ManuelSans

    ManuelSans

    ManuelSans

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    Hello all,

    So on my last ride I felt like there was an abnormally loud ticking/knocking. It seems to be coming from the fuel pump.

    My first question: What is the standard/normal sound behavior of the fuel pump at 1. Key-On and 2. after Ignition?

    Basically I would like to confirm whether what I hear is a problem or it isn't a problem. Here below is what I expect and what I actually get in the two situations. Attached are the audio files.

    1 - At Key-On:

    What I expect: fuel pump to tick approx ~10 times, with the volume fading out and even with a slightly increasing time between ticks.
    What I get now: fuel pump ticks between 32 and 40 times, with same time space between ticks

    2 - After ignition:

    What I expect: I should not hear the fuel pump
    What I get now: I hear the fuel pump in the midst of the engine sounds at idle
     

    Attached Files:

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