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Hi I have a 1989 Jeep Cherokee 4.0L Straight Six and fuel leak. Yesterday I tore off and cleaned the fuel rail and injectors. I installed it back in and the line going into the pressure regulator started leaking. I'm attaching pics of what I'm working with. I am not sure where the o rings go. I need this resolved as of right now. Thank you.
 

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Its the O-ring, when you took it apart of broke the seal on an old o-ring. Not a hard fix, replace the o-ring, and when you replace it be sure to add a little bit of lubricant to the o-ring, helps keep it from drying out after it makes a good seal.
 

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I had the same problem but I had to replace Fuel Injectors. I hope you don't have the same problem. It's pretty expensive when yu have to pay a mechanic to do it.
 
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