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Old 10-15-2016, 06:00 PM
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Relocated vacuum pump- when does it come on?

I relocated my vacuum pump and started the Jeep to make sure everything was working and got nothing from the pump. Should it be running after starting the Jeep?
Thanks. Trying to figure out if I wired it correctly.

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Old 10-15-2016, 06:26 PM   #2
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You will hear it very rarely. The 3.6 doesnt produce enough vacuum in all situations so you it wont run unless you are in certain situations. I get it every now and then when I am crawling and using the brakes often.

The first time it comes on you will know. Mine is very loud after it was moved under the hood.

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Old 10-15-2016, 10:39 PM   #3
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I've only heard mine in 4L going down a steep hill with turns very slowly.
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Old 10-16-2016, 12:08 AM   #4
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Quote:
Originally Posted by dstevens View Post
I've only heard mine in 4L going down a steep hill with turns very slowly.
Yup, In that situation, your motor is pretty much just idling making very little vacuum and your brake assist is using a ton of vacuum.

That being said, I have heard it at 70mph on the highway so who knows
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Old 10-17-2016, 10:03 PM   #5
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Quote:
Originally Posted by Pridnjoy View Post
I relocated my vacuum pump and started the Jeep to make sure everything was working and got nothing from the pump. Should it be running after starting the Jeep?
Thanks. Trying to figure out if I wired it correctly.
The vacuum pump won't run at idle. There is no point for it to run if brakes are not needed. You have to start driving the jeep from cold for the pump to run and create vaccum in the braking system. I hear mine every morning when I leave for work, mine's relocated under the hood.
Get someone to drive the jeep slowly from a stop while you walk by it and you'll hear it running for a few seconds. It only runs as needed.
Fyi, if it wouldn't run at all you wouldn't have brakes at all.
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Old 10-18-2016, 12:08 AM   #6
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Originally Posted by jeep670 View Post
The vacuum pump won't run at idle. There is no point for it to run if brakes are not needed. You have to start driving the jeep from cold for the pump to run and create vaccum in the braking system. I hear mine every morning when I leave for work, mine's relocated under the hood.
Get someone to drive the jeep slowly from a stop while you walk by it and you'll hear it running for a few seconds. It only runs as needed.
Fyi, if it wouldn't run at all you wouldn't have brakes at all.
You would have brakes, they just wouldnt feel the same and wouldnt be as effective.
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Old 10-18-2016, 09:57 AM   #7
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Originally Posted by Tweak View Post
You would have brakes, they just wouldnt feel the same and wouldnt be as effective.
Correct.

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