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Fuel Filter Vac Gauge

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by gravelhauler, Feb 12, 2024.

  1. Feb 12, 2024 #1
    gravelhauler

    gravelhauler Medium Load Member

    630
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    Oct 20, 2011
    Lake Charles, La
    0
    I have a 2006 Pete 379 with a C15 MXS Cat. The fuel filter vac gauge is reading 12 to 12 1/2. Truck is running and pulling great. Any ideas on what could be causing that?
     
    gravelhauler, Feb 12, 2024
    gravelhauler, Feb 12, 2024
    #1
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  3. Feb 12, 2024 #2
    bad-luck

    bad-luck Road Train Member

    3,378
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    Nov 16, 2013
    Baltimore, Maryland
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    At 12 I am sure its it's in the red. I change mine when it gets in the red. Trucks that don't have a fuel restriction guage, generally are changed when noticeable power loss or sputter occurs. In my opinion it's best to change it before power loss and sputtering, so you don't have to change it on the side of the road.
     
    bad-luck, Feb 12, 2024
    bad-luck, Feb 12, 2024
    #2
    gravelhauler and PSM379 Thank this.
  4. Feb 13, 2024 #3
    gravelhauler

    gravelhauler Medium Load Member

    630
    414
    Oct 20, 2011
    Lake Charles, La
    0
    So basically the fuel filter vac gauge acts as a warning that your filters are getting bad? I was just wondering if anything else would cause it to climb.
     
    gravelhauler, Feb 13, 2024
    gravelhauler, Feb 13, 2024
    #3
  5. Feb 13, 2024 #4
    bad-luck

    bad-luck Road Train Member

    3,378
    6,252
    Nov 16, 2013
    Baltimore, Maryland
    0
    Yes that is correct.
     
    bad-luck, Feb 13, 2024
    bad-luck, Feb 13, 2024
    #4
  7. Feb 13, 2024 #5
    AModelCat

    AModelCat Road Train Member

    29,416
    161,658
    Jul 7, 2015
    Canuckistan
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    Any restriction in the fuel system prior to where the gauge is plumbed in will show up on the gauge.
     
    AModelCat, Feb 13, 2024
    AModelCat, Feb 13, 2024
    #5
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