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Vacuum source for PSE

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Could I splice into the vacuum line that is located right below where you have your vacuum tank mounted. Both of the rubber pieces on each side of the throttle body already have a vacuum line connected to them and I could not get to the rubber pieces on the tuning pipe (the large pipe behind the throttle body). The vacuum line that connects to something right below where the vacuum tank is mounted comes from the rubber piece on the right side of the throttle body.

If I can't spice into this line are there other options to get a vacuum source for the exhaust?



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You should install the rubber coupling the came with the PSE kit to either #30 or # 38 on the intake distributor. These may be a litlle harder to get at, but I would not splice into the existing ones.

Edited by mffarrell
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Both 28 and 38 already have a vacuum hose attached to them. I could put the coupling that came with the PSE in the rear #38 position, but the clamps holding both those coupling down are behind them and there is no way to get to them. I have the extra coupling that came with the kit and I am going to try putting in a slightly larger tube in the hole in that coupling and then put a T fitting in as close to the coupling as I can. I will then connect the existing vacuum tube and the PSE one to the T. By installing it close to the coupling, I should get adequate vacuum to both sources. I will try bypassing the switch to make sure this is going to work. I believe if I bypass the switch, it should put the PSE in quite mode all the time. If it causes problems, I will just leave it as is and live with not having the switch.

Thanks for your help and also for emailing me the install tips. I currently have everything installed for the vacuum system except for hooking it up to the engine. I don't think it will be that hard to run the wire, but I want to make sure the vacuum source will work first.

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Read the tobic about PSE cut off in the How to do section. That describe the only and perfect way to do the job. I did the job with a switch so now I can decide if if want the PSE speed cut off to work or not. Very easy to do. Cost around 2 USD and takes 30 min max.

Good luck........the sound of the PSE is GGRREEAAATTTT

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  • 2 weeks later...

Well I went ahead and put a Y fitting in just before whatever vacuum module that is that is located just below where the vacuum tank that came with the PSE is mounted. I hooked up the vacuum tank to the Y fitting and then by-passed the switch just to make sure that the existing vacuum line could support both the PSE and whatever was already there. I have driven a couple hundred miles now with no problems. The PSE has remained in the quiet mode the entire time since I by-passed the switch, so I know the vacuum is working fine.

I have went ahead and ordered the switch and intend to wire that up in the next couple weeks.

It seems to me that anyone wanting to install the electronics with the PSE could use this same source for the vacuum and not have to mess around with removing the throttle body and putting in the rubber sleave that came with the PSE. Would make the install much easier.

Thanks for everyone's input on this.


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  • Moderators

Here is where I got my vacuum source.

on my 02 Cab there is a vacuum source on the rear left intake runner that is being used for another function:


I took a "Y pipe" fitting and split that line into 2 runs, one for the existing application, and the other for the PSE vacuum needs. The rest of the PSE run is plumbed as per the installation instructions.


Very simple and easy. Vacuum is vacuum, and there is nothing wrong in having a multiple run vacuum source from a single tap on the intake runners. The little black and white thing in the picture is a back-flow valve. That maintains the vacuum on the white side of the valve when the engine is off. Since the PSE has a volume reservoir in its run, there is not an issue with not having sufficient vacuum to run both applications from a single tap.

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