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93 ZJ 5.2L Fuel Rail/Fuel Pressure Sending Unit Leak

Discussion in 'Cherokee' started by TinyInkognegroT, Oct 17, 2019.

  1. Oct 17, 2019 at 8:37 AM
    #1
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Started smelling gas with the engine running but there's no gas leak coming from the gas tank or fuel pump. I opened up the hood to find on the driver side fuel rail where the Schrader valve is and towards the back by the distributor, there's a piece attached to the fuel line rail that is leaking gas... Here is a video I took yesterday

    https://youtu.be/4FWvSDeZ9mQ
     
  2. Oct 17, 2019 at 8:51 AM
    #2
    Awrench

    Awrench Well-Known Member

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    looks like FPR -fuel pressure regulator. Remove the vac line should be NO fuel in line BUT I suspect as you did not work with it lately? a new component FPR is needed.

    1 bolt a new o ring (comes installed)

    FPR.jpg
     
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  3. Oct 17, 2019 at 9:05 AM
    #3
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Thank you! @Awrench
     
  4. Oct 17, 2019 at 9:10 AM
    #4
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Do I have to replace the whole regulator or can I replace the o-ring? Or pull it regulator from the salvage yard? A new regulator is like $80 and I'm afraid I'm not going to have that until next Friday
     
  5. Oct 17, 2019 at 9:12 AM
    #5
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Bingo.
    Relatively expensive for it's size at about $80.
     
  6. Oct 17, 2019 at 9:19 AM
    #6
    Prerunner1982

    Prerunner1982 Well-Known Member

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    You could try replacing the O-rings, they are cheap and the job isn't that hard so if it didn't work you aren't out much money or time.
    A junkyard part may get you by but if it's an original part as well then you are on borrowed time....but maybe that is all you need.
     
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  7. Oct 17, 2019 at 9:22 AM
    #7
    Awrench

    Awrench Well-Known Member

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    tHIS IS A FUEL LEAK - priority- NOT i WILL GET TO IT AND CONTINURE TO RUN ENGINE -
    yOU will have to get it apart, a good eye on the exact location of leak - I mentioned the VACUUM LIne as that is evidence of a diaphragm failure of FPR, Yes the "O" ring may have failed I cant guess its a lets inspect, check type of situation.






    SORRRY STICKIng KEYS
     
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  8. Oct 17, 2019 at 10:51 AM
    #8
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    I'm going to get to it after work today, but I do have to drive it tomorrow to work and back and then I'm off for the weekend so I won't be driving and I'll be fixing that regulator
     
  9. Oct 17, 2019 at 10:53 AM
    #9
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    So I need to check that vacuum line too ? Is the vacuum line attached to it so I can find it or can you send me a diagram or picture of the location of it?
     
  10. Oct 17, 2019 at 1:41 PM
    #10
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Does anybody know the size of the o-ring? I'm trying to buy one but nobody seems to have this specific o-ring for the fuel pressure regulator. I'll have to take off the fuel pressure regulator and walk to the auto parts store to size it
     
  11. Oct 17, 2019 at 3:29 PM
    #11
    aggrex

    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Auto parts store might have a few FPR to check out to compare O-rings
     
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  12. Oct 18, 2019 at 9:27 AM
    #12
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Took my fuel pressure regulator off and took it to AutoZone and they had a o-ring assortment kit for 8 bucks. Nothing seemed to match the little o ring but there was a match for the bigger one and I used it and now I have no leak... FYI, if you're using o-rings for fuel related repairs, the brown assortment kit is for fuel-related repairs, not the black ones.

    PHOTO_20191017_192126.jpg
    PHOTO_20191017_194302.jpg
     
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  13. Oct 18, 2019 at 9:41 AM
    #13
    Awrench

    Awrench Well-Known Member

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    8$ bucks all done GREAT!!! :thumbsup:

    What is next project?
     
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  14. Oct 18, 2019 at 9:43 AM
    #14
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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