Installing A Fuel Pressure Gauge

Discussion in 'Fox 5.0 Mustang Tech' started by golf4283, May 22, 2014.


  1. mikestang63

    mikestang63 Mustang Master

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    Those liquid filled gauges on the schrader valve can break and you get the fountain of gas spewing out on your hot engine.
     
    #41
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  2. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Ask me how I know that too
     
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  3. 85rkyboby

    85rkyboby Active Member

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    So it's safe if it's not a liquid filled gauge?
     
    #43
  4. jrichker

    jrichker StangNet's favorite TOOL SN Certified Technician Founding Member

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    The liquid in most liquid filled gauges is glycerin, a member of the alcohol family. Like most alcohols it is flammable It is used with gauges because it does not flash fire or explode with directly exposed to oxygen. It has a slightly thick consistency which helps dampen gauge fluctuations due to vibration. It also has some lubricating properties that make it a good choice for gauges and clockwork type machinery.
    See http://www.sbioinformatics.com/design_thesis/Glycerol/Glycerol_-2520Properties&uses.pdf for more information

    The only hose suitable for use with fuel pressure gauges is a stainless steel braided hydraulic hose. The hose needs to be routed away from chaffing, rubbing or resting on the exhaust system. It should be secured with Adel (cushion) clamps to keep it in place and away from heat or rubbing. This is old stuff for those of us who have worked on aircraft, but not to most auto mechanics.
    Use Adel camps that are fuel resistant: look for -DF or -DG as the last two characters in the part number. These are oil & fuel resistant.

    [​IMG]

    [​IMG]

    More info on Adel calms see http://www.aeroelectric.com/articles/adel.html

    Purchase Adel clams from: http://www.aircraftspruce.com/catalog/appages/ms21919clamps.php

    My first post in this thread has links to all the plumbing hardware needed for a fuel pressure gauge installation.
     
    #44
  5. jAEded

    jAEded Active Member

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    Is that if you leave the schrader valve installed with the gauge? The previous owner installed a gauge where the valve was, but the schrader itself is no longer installed. The original gauge failed a while ago so I went with a decent 0 - 100 psi liquid filled gauge. Its been on for a few years, but I do worry about vibration and the offset weight hanging from the hard line causing the hard line to fail.

    How did yours break Madspeed? I'm worried now.
     
    #45
  6. mikestang63

    mikestang63 Mustang Master

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    you remove the schrader valve and screw on the adapter and the gauge. I really see no reason whatsoever to need a gauge on the fuel rail. You only need to know thr FPR when you are testing, or changing the FP.

    Either have a remote mounted one on the fenderwell or cowl, or just use a FPR test gauge when you need to adjust it.
     
    #46

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