Cummins Marine Diesel Repower Specialists › Forums › General Discussion › Vacuum Gauge Bouncing

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  • August 10, 2022 at 4:57 am #135221

    Blake H
    Participant
    Engines: 6BTA
    Location: Long Island, NY

    My gauge on my smx single remote fuel filter is bouncing quite a bit while the engine is running. I recently replaced the fuel filter and took all of the fittings apart for my primer ball setup because they were leaking at the connections. I lathered them up in tru blu sealant and put it all back together. Maybe I put too much causing fuel intake issues? Engine runs fine just want to get it to where the gauge runs steady so I can tell when itā€™s time to change the filter.Ā <br /><br />

    I have a video of it but the forum wonā€™t allow it to be uploaded Ā 

     

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Viewing 8 replies - 1 through 8 (of 8 total)
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  • August 17, 2022 at 5:05 pm #135595

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    Rotate the tiny screw in the middle of the knob 1/4 Turn CCW, that will tighten the RED needle some.. The vibration from the fuel pulsations is “vibrating” it up.Ā  If it needs more, do it again–1/4 turn at a time

    1 user thanked author for this post.
    Blake H
    August 16, 2022 at 6:15 pm #135561

    Blake H
    Participant
    Engines: 6BTA
    Location: Long Island, NY

    Ran the boat at varying RPMs tonight and the gauge would settle in once the engine is under load. The black needle barely moved from zero which is what I would expect considering it is a fairly new filter. So my question is how is the red needle getting moved so high up on the gauge?

    August 15, 2022 at 6:01 am #135453

    Rob Schepis
    Forum Moderator
    Vessel Name: Tenacious
    Engines: 6BTA 5.9 330's - "Seaboard Style"
    Location: Long Island, NY
    Country: USA

    That link is good.Ā  Is the center shaft moving with the needle?Ā  Could the needle be loose on the shaft?Ā  Does it smooth out when you raise the rpm’s?

    August 15, 2022 at 5:02 am #135448

    Blake H
    Participant
    Engines: 6BTA
    Location: Long Island, NY

    https://youtube.com/shorts/EmUNabUWBJ4?feature=share<br /><br />

    Let me know if itā€™s still not working. Thanks for the help!

    August 14, 2022 at 7:36 am #135430

    Gene Fuller
    Participant
    Vessel Name: Yorkshire Rose
    Engines: QSB5.9 380
    Location: Punta Gorda, Florida
    Country: USA

    Video is “private”. You need to change the setting on YouTube.

    August 14, 2022 at 6:26 am #135426

    Blake H
    Participant
    Engines: 6BTA
    Location: Long Island, NY

    YouTube link

    https://youtube.com/shorts/EmUNabUWBJ4?feature=share<br /><br />

    Hopefully this works. I believe itā€™s a new issue as the red indicator always ran true. I just replaced the filter recently so I know the filter isnā€™t as clogged as itā€™s showing.Ā <br /><br />

    When I bump up the rpmā€™s itā€™s still bouncing but not quite as bad but the indicator stays low on the gauge so I know that the red indicator is getting thrown off.Ā 

    August 12, 2022 at 3:52 am #135309

    J Dragon
    Participant
    Vessel Name: Dragon
    Engines: Cummins 6BTA 5.9 315hp
    Location: MA
    Country: United States

    How much bouncing?

    Mine has always floated a bit at idle but goes ā€œfirmā€ once you bump RPMs up a bitĀ 

    August 10, 2022 at 2:18 pm #135251

    Rob Schepis
    Forum Moderator
    Vessel Name: Tenacious
    Engines: 6BTA 5.9 330's - "Seaboard Style"
    Location: Long Island, NY
    Country: USA

    Post the video on YouTube and then post the link here

    Is this a new issue? Is the liquid fill still in the gauge?Ā  Does this happen at all rpm’s?

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