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Comanche91
01-20-2013, 08:39 PM
http://i182.photobucket.com/albums/x297/comanche91/5-2.jpg

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/store2/product_info.php?products_id=1337

Use teflon tape on the gauge pipe threads then snug it on the adapter:
http://i182.photobucket.com/albums/x297/comanche91/2-5.jpg

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.
http://i182.photobucket.com/albums/x297/comanche91/1-5.jpg

My ever-present red-eyed helper:
http://i182.photobucket.com/albums/x297/comanche91/3-5.jpg

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:
http://i182.photobucket.com/albums/x297/comanche91/4-4.jpg

Start 'er up and check for leaks. Hmmm, I'm about two PSI low:
http://i182.photobucket.com/albums/x297/comanche91/5-2.jpg

Brasscatz
01-20-2013, 09:23 PM
Nice writeup buddy!

Niac
01-20-2013, 10:06 PM
:yourock: SWEET :yourock:

Joliet Johnny
02-07-2013, 03:23 AM
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. :thanx::beavis:

XjJeepacorn
03-19-2013, 03:23 PM
That's a great idea I'm so doing this!

4x4Dalton
03-20-2013, 07:51 PM
Me to. Thanks for the write up

easttxhunter
03-23-2013, 08:32 AM
Do they make a clear distributor cap for engines? I googled it and nothing come up

XjJeepacorn
03-23-2013, 01:21 PM
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 :)

Brasscatz
03-23-2013, 10:17 PM
She loves it so much she posted it thrice....

XjJeepacorn
03-23-2013, 11:56 PM
It wasn't showing up lmao

I just like making extra work for you lol ;)

4.3LXJ
03-24-2013, 12:43 AM
She can measure it twice now :D

ParadiseXJ
03-24-2013, 09:08 AM
She can measure it twice now :D

Once with just the ignition on...and once with it running...nice.
Good write-up Don. You did this after your schrader started leaking??

Mudderoy
03-24-2013, 10:42 AM
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...

BlueXJ
04-19-2013, 10:05 PM
Great write-up.

92warwagon
04-24-2013, 12:59 AM
well said and thanks

lewdwagon844
05-18-2013, 04:40 PM
:greensmilies-017:: Is 37 P.S.I. the right pressure? Going to try this and see what the book says.

Azzy
07-15-2013, 07:09 AM
Cool. Interested to see the longevity of the valve in under-hood conditions.

Mudderoy
07-21-2013, 03:19 PM
:greensmilies-017:: Is 37 P.S.I. the right pressure? Going to try this and see what the book says.

I believe it's 49 psi for the 97+ fuel systems.

justxjs
06-10-2014, 05:28 PM
nice will have to do this myself thanks!

TSquared42
11-18-2014, 01:14 PM
Great idea! :D

Basslicks
02-19-2016, 09:13 AM
Any updates regarding longevity?