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  1. #1
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    Default Easy Permanent Fuel Pressure Gage



    Here's a simple little mod that saves you time by enabling you to check your fuel pressure any time you want. The parts:
    1.) A 0-60 PSI liquid-filled 1-1/2" fuel pressure gauge from Jegs, p/n 555-41012
    2.) A brass 1/4" flare x 1/8" female NPT straight adapter fitting from here: http://www.casperselectronics.com/st...oducts_id=1337

    Use teflon tape on the gauge pipe threads then snug it on the adapter:


    After the engine has been sitting overnight and is cold, bleed any fuel rail pressure off first by depressing the Schrader valve needle. Have a rag handy in case the fuel squirts out. Then remove the core needle from the fuel rail Schrader valve w. an extractor tool, same tool used for bicycle tires.


    My ever-present red-eyed helper:


    Screw the assembled gauge and adapter on the Schrader valve. Since it's a flare, do not use teflon tape, and do not over-tighten:


    Start 'er up and check for leaks. Hmmm, I'm about two PSI low:
    -Don

    ROLL TIDE!

  2. #2
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    Default Re: Easy Permanent Fuel Pressure Gage

    Nice writeup buddy!

  3. #3
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    Default Re: Easy Permanent Fuel Pressure Gage

    SWEET

  4. #4
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    Default Re: Easy Permanent Fuel Pressure Gage

    Talk about a duh moment for me. I was trying to figure out a complicated way to do this affordably and safely and you just removed the Schrader valve and added that adapter. I am going to do this mod to not only my XJ but my parents cars too. Add this to a clear distributor cap and a no start would be so much easier to diagnose.

  5. #5
    XjJeepacorn's Avatar
    XjJeepacorn is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Easy Permanent Fuel Pressure Gage

    That's a great idea I'm so doing this!
    Be ware of my BIG DOG complex

  6. #6
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    Me to. Thanks for the write up
    Im busier then a set of jumper cables at a Redneck picnic

  7. #7
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    Default

    Do they make a clear distributor cap for engines? I googled it and nothing come up

  8. #8
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    XjJeepacorn is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default

    FYI,

    I just picked up this gage at princess auto for 15 bucks and I'm going to go to lows later to see if I can find some fittings for it. My cherokee is a 99 and the file pressure test port is located on the other side of the throttle body so this one I picked up should work out well for me
    Attached Thumbnails Attached Thumbnails image.jpg  
    Last edited by Brasscatz; 03-24-2013 at 11:34 AM.
    Be ware of my BIG DOG complex

  9. #9
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    Default Re: Easy Permanent Fuel Pressure Gage

    She loves it so much she posted it thrice....

  10. #10
    XjJeepacorn's Avatar
    XjJeepacorn is offline Level: Uber Jeep Cherokee Trailer Queen
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    It wasn't showing up lmao

    I just like making extra work for you lol
    Be ware of my BIG DOG complex

  11. #11
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    Default Re: Easy Permanent Fuel Pressure Gage

    She can measure it twice now
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  12. #12
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    Default Re: Easy Permanent Fuel Pressure Gage

    Quote Originally Posted by 4.3LXJ View Post
    She can measure it twice now
    Once with just the ignition on...and once with it running...nice.
    Good write-up Don. You did this after your schrader started leaking??
    1. 1990 XJ Laredo AW4-4.0L-NP231 D35/D30-OPEN cooling-3.5 full pack-etc.-etc.
    #2. 1988 MJ Pioneer AW4-4.0L-NP231J-D30/D44 LSD - OPEN cooling - 3" lift - 31's

    Like your freedom? Thank a Vet.



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    Default Re: Easy Permanent Fuel Pressure Gage

    Quote Originally Posted by XjJeepacorn View Post
    It wasn't showing up lmao

    I just like making extra work for you lol
    Some sections require moderator approval. Not very many just a couple to three. So moderator, or admin, has to approve your post, attachment, etc...

  14. #14
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    Default Re: Easy Permanent Fuel Pressure Gage

    Great write-up.
    Hey bubba get your hand off my ass,

    Some days it is just not worth it to gnaw through the leather restraints.

    R.I.P. Brian 96_XJ Perrine 1990-2011

  15. #15
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    Default Re: Easy Permanent Fuel Pressure Gage

    well said and thanks

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