When swapping over Gen III hemis, do people typically graft the hemi's EVAP system to the cars OEM EVAP components? I've got a 1991 YJ Wrangler. It has an EVAP canister under the brake booster along with vent tubes that run back to the tank. I'm putting in a 6.1L Gen III hemi from a 2006 Jeep Grand Cherokee. Should I bring over the Cherokee EVAP components?
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That’s fully up to you and where you live. Legally, if the vehicle originally had an evap system, then it should have it after an engine swap. If you live in an area with strict emission laws , you could get fined for not having it. Some places, like Arkansas, are much more laxed. The hemi will run fine with it capped off or bypassed, but it’s not street legal in some areas.