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  1. #1
    Sr. Engineer FergusonT's Avatar
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    Default Fuel line "chatter". . . .

    So after recently replacing a fuel pump, I notice a chattering noise coming from my fuel line. Very weird.
    1999 Chevrolet Suburban LS K1500
    1991 Chevrolet S10 4.3L 4x4
    2005 Suzuki Forenza (GM/Daewoo)

  2. #2

    Default Fuel line chatter

    You must have bought a non OEM AC Delco pump with out the anti pulse module. You will need to live with it.

  3. #3
    Sr. Engineer FergusonT's Avatar
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    Default

    Ac delco MU1613

  4. #4
    Legend

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    Default

    the fuel pump should make a whine sound. with a chattering sound this may be from the pump suction hose having a leak or the regulator is not returning excess fuel pressure back to the fuel tank / restricted /crushed return line.

    I would disconnect the return line at the fuel pump hose connector using some clear tubing direct this flow into a container and observe the flow. if lots of bubbles this may mean the intake pick up tube has a leak. if no flow or not flowing smoothly then it may be the return line or regulator stuck or pulsing.

    the fuel pressure gauge should be steady not jumping to much also.

  5. #5
    Sr. Engineer FergusonT's Avatar
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    Well the pump itself sounds fine. Its just down near the frame rails.... I just haven't had my garage clear enough to pull it in and crawl underneath it.

    When changing the fuel filter it was a bit tough coming off...I am thinking maybe I tweaked the fuel line in the process.

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