post #1 of Old 08-19-2010, 07:06 PM Thread Starter
CrawlerYJ
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How do I replace a fuel pressure regulator in jeep?

Anyone have a video or pictures on how to replace a fuel pressure regulator on jeep 4.0l?

Thanks

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post #2 of Old 08-19-2010, 07:12 PM
Apollo12227
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VERY easy...

Step 1: Relieve fuel pressure via the fuel rail... There is a cap on the fuel rail, inscrew it, push in the valve and release the pressure.

Step 2: Remove the single vaccum line from the regulator.

Step 3: Unscrew the single bolt holding (clamping) the fuel pressure regulator to the fuel rail.

Step 4: Pull pressure regulator out of the socet, and push in the next one. Use a tad bit of grease on the o-ring to keep it from cutting, drying out, etc...

You can TEST the fuel pressure regulator. All you need is to rent a fuel pressure tester. As your reading pressure at idle, pull the vaccum line off the regulator and the fuel pressure should INCRASE by 7-8PSI... if it fails to increase the regulator is bad.

Another test for the fuel system is to pinch the return line shut momentarily, if the fuel pressure shoots up to 70-90psi then your fuel pump is functioning at acceptable pressure as well.
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post #3 of Old 08-19-2010, 07:17 PM Thread Starter
CrawlerYJ
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Found it. Front of the fuel rail. Looks simple to replace.

Question? Remove gas cap, start, pull fuel fuse? Then replace FPR?
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post #4 of Old 08-19-2010, 07:21 PM
Apollo12227
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Um.... no need to remove the cap, just follow what I wrote lol... Relieve the pressure at the rail, take out the bolt, pull out the PR, insert new regulator, put bolt back in, start jeep...

Not sure what your missing within step 1, 2, 3, and 4...

Step 1: Relieve fuel pressure via the fuel rail... There is a cap on the fuel rail, inscrew it, push in the valve and release the pressure.

(Edit: The release valve works/looks kind of like a car or bycycle tire valve... Push it in with a screwdriver, let the fuel spray out, clean up the mess, and continue.)

Step 2: Remove the single vaccum line from the regulator.

Step 3: Unscrew the single bolt holding (clamping) the fuel pressure regulator to the fuel rail.

Step 4: Pull pressure regulator out of the socet, and push in the next one. Use a tad bit of grease on the o-ring to keep it from cutting, drying out, etc...
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post #5 of Old 12-05-2013, 03:12 PM
jgregory6375
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Is this the same on a 92 ??? Thankyou
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post #6 of Old 12-06-2013, 07:51 AM
TSEJEEPERS
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yes

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
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