Jeep Jk Vacuum Pump. For the most part, there's nothing wrong with where it's placed but, if you choose to run an aftermarket front bumper and install a large winch that sits between the frame rails, it is. Some google research led me down the path of the Brake Boost Vacuum Pump being the most likely culprit.

EVO MFG 2012 Jeep JK Wrangler Vacuum Pump Relocation Kit – Project-JK.com
EVO MFG 2012 Jeep JK Wrangler Vacuum Pump Relocation Kit – Project-JK.com (Georgia Jensen)
I noticed you moved it under the hood. Systems of issues w/ vaccuum pump booster thingy Since they are new, they do not contain any used.

This kit is designed to move your vacuum pump out from under the front bumper to under the radiator.

Did Jeep change the vacuum pump location?

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For the most part, there's nothing wrong with where it's placed but, if you choose to run an aftermarket front bumper and install a large winch that sits between the frame rails, it is. This makes it possible to use a bumper that will recess your winch between the frame rails of your Jeep. Relocation Bracket: The frame mounted vacuum canister on late model JK Wranglers can interfere with aftermarket bumpers.