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Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ/MJ Cherokee Non-Technical Forum > Fuel Rail for OBDI and OBDII 4.0

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Unread 05-12-2013, 07:38 PM   #1
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1985 CJ7 
Join Date: Sep 2008
Location: White Springs, Florida
Posts: 9,278
Fuel Rail for OBDI and OBDII 4.0

My son and I are putting a 4.0 in his CJ. I have some good feedback on the CJ side of the forum, but you guys are the real 4.0 experts! I'm hoping you can answer the following questions.

I bought a '97 XJ Classic for a donor car. The engine is for the CJ. The rest of the car will be parts for another son's XJ build. I read the "Official 4.0 Swap Thread" on the CJ forum. It has helped a lot, but it has created more "opportunities"! We are swapping from OBDII to OBDI, which I am learning about. I pulled a fuel rail from a '92 4.0 at the JY, with the pressure regulator and return line. After getting it home and pulling the injectors and PR, it has big flakes of rust coming out of it. I have to assume there is no way to clean this thing up for use?? Or can it be done?

Out of ignorance, I pulled the fuel rail from a later model XJ (don't know what year)... BEFORE I understood about OBD I and II. This one is clean, but it does not have a fuel return line, as it is OBDII. It appears to have the PR dead in the middle of the rail. Can I use this one??

I have the complete '97 OBDII engine and fuel rail, and I bought the WJ fuel filter/regulator, so I could go with it, but I like the idea of the PR on the rail. Should I buy a new OBDI rail or should I adapt one of the OBDII rails? What would YOU do? TIA

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