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Thread: Liquid filled fuel presure guages

  1. #1
    Junior Member JOURNEYMAN
    Join Date
    Dec 2007

    Liquid filled fuel presure guages

    Are liquid filled fuel presure guages a bad idea? I think I've read that somewhere. I'm thinking of replacing my non filled guage soon.

  2. #2
    Senior Member RACING JUNKIE fla1976's Avatar
    Join Date
    Aug 2007


    The liquid in the gauges is usually glycerine. The purpose is to dampen the needle movement. The liquid can cause errors when the temp is high and they dampen too much. Pressure can build up in the gauge from the heat and cause them to read low. This is because the gauge reads differential pressure and the pressure in the gauge is different than ambient pressure outside the gauge. The error isn't much, less than a few PSIG. If you don't have a problem with the needle bouncing around, I'd just stay with the standard gauges. JMO.

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2003
    Coldwater, MI
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines

  4. #4
    Senior Member EXPERT BUILDER
    Join Date
    Jan 2005
    i agree

  5. #5
    Junior Member JOURNEYMAN
    Join Date
    Dec 2007
    Thanks for the info!

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