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Default Easy Permanent Fuel Pressure Gage
by Comanche91 01-20-2013, 08:39 PM



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:
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  #2  
Old 01-20-2013
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Default Re: Easy Permanent Fuel Pressure Gage

Nice writeup buddy!
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Old 01-20-2013
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Default Re: Easy Permanent Fuel Pressure Gage

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  #4  
Old 02-07-2013
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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.
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Old 03-19-2013
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Default Re: Easy Permanent Fuel Pressure Gage

That's a great idea I'm so doing this!
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Old 03-20-2013
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Me to. Thanks for the write up
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Old 03-23-2013
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Do they make a clear distributor cap for engines? I googled it and nothing come up
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Old 03-23-2013
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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
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Old 03-23-2013
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Default Re: Easy Permanent Fuel Pressure Gage

She loves it so much she posted it thrice....
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It wasn't showing up lmao

I just like making extra work for you lol
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Old 03-24-2013
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Default Re: Easy Permanent Fuel Pressure Gage

She can measure it twice now
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  #12  
Old 03-24-2013
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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??
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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...
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Old 04-19-2013
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Default Re: Easy Permanent Fuel Pressure Gage

Great write-up.
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  #15  
Old 04-24-2013
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Default Re: Easy Permanent Fuel Pressure Gage

well said and thanks
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