Fuel tank pressure sensor fix? Installing OBD2/ 96 Engine into a 91 YJ - JeepForum.com
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Unread 06-25-2013, 12:08 AM   #1
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Location: Placentia, CA
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Fuel tank pressure sensor fix? Installing OBD2/ 96 Engine into a 91 YJ

Im installing a 96 Cherokee 4L engine into a 91 YJ. So my question is, how do I deal with the fuel pressure sensor evap issue?

Does the Cherokee pump have an integrated pressure sensor that I could separate and use somehow? Or is there some alternate fuel pressure sensor or resistor to fool the ECU?

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Unread 06-27-2013, 01:21 PM   #2
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This sounds like the least of your issues if you intend to use OBDII sensor equipped engine on an OBDI body. What motor/drivetrain is being replaced? I would suggest converting your '96 Cherokee engine to OBDI to match the body. Much easier in the long run. The OBDII can be done, but the pain vs. the gain is not typically there.
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Unread 06-27-2013, 04:48 PM   #3
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Given you're in Cali, I'm guessing to swap to the 4.0 you need to take all the emissions control stuff with you for CARB compliance?

The evap pressure sensor I believe is a separate unit on the vapor line. I Googled images of the fuel tank and sending unit and it's not there. I then did the same with "96 cherokee vapor pressure sensor" and it's showing a stand-alone piece. BTW, this thread is the #1 response to that query.

If it's a separate piece you should be able to Tee it into the vapor line.
'91 Frankenheep YJ. 4.0, 4" BDS, Richmond 8.8, Titan 12k, 35" KM2's, rust.
'88 YJ, 4.2/4.0 head, +4" & shackles, BFG 33's (sold)
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