Vacuum routing - 18 mani, E85, Boost

[CrackedHorn]

Gen2 with an 18 mani. IMRC delete. No aspirator.

I'm installing a Paxton and am running a return style fuel system.

I have a question about how to run vacuum lines.


For the BOV, I believe I can use the brake booster line, install a check valve, and then tee off after that to the BOV.

But, for the boost/vacuum reference on the Fuel Pressure Regulator, am I able to tee into this brake booster line again? Or should I tap into it from elsewhere?

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[SheepDog]

Don't use the brake booster line.

Use the vacuum port that was originally intended for your IMRC actuators, and run that to a vacuum block. Then everything can have its own source

 

[CrackedHorn]

Don't use the brake booster line.

Use the vacuum port that was originally intended for your IMRC actuators, and run that to a vacuum block. Then everything can have its own source

I'm running breathers, as well.



Would I be able to use the pass side port that the PCV went to for the regulator and the IMRC port for the BOV?

I'm guessing that a Tee in the IMRC port going to BOV and FPR wouldn't work.


I may be overthinking this..
This is the last step before I fire it up and I'm getting anxious

 

[K4fxd]

I'd use the PVC port and tee off whatever I needed.

 

[SheepDog]

I'm running breathers, as well.



Would I be able to use the pass side port that the PCV went to for the regulator and the IMRC port for the BOV?

I'm guessing that a Tee in the IMRC port going to BOV and FPR wouldn't work.


I may be overthinking this..
This is the last step before I fire it up and I'm getting anxious

Absolutely. If you are using breathers then your PCV port in the intake manifold is the perfect source. I did the same thing.
Use the OEM push lock 5/8" fitting that is on the OEM PCV tube from the passenger side.
Cut the hard plastic line off of it.
Call Jeff Bezos and Order some 5/8" silicone vacuum tube, some 3/8" vacuum tube, as well as a 5/8" to 3/8" barbed reducer. Depending on what your Paxton kit came with, you will also likely need some 5/16" silicone vaccum hose for the BOV and Pressure regulator.
Order a vacuum block. - you don't need anything fancy for this, just one that is aluminum and has aluminum fittings.

 

[SheepDog]

Here are more recent pictures after I added a Boost gauge

 

[CrackedHorn]

So, no check valves needed then?
Even for the brake booster line?
I'm guessing the brake reservoir has a check valve in it

 

[SheepDog]

So, no check valves needed then?
Even for the brake booster line?
I'm guessing the brake reservoir has a check valve in it

Do not tamper with or cut the brake booster line.

The entire point of using the vacuum block, is that you have a dedicated and strong vacuum/boost reference for all of the accessories you want to use.

 

[CrackedHorn]

That works.
Thank you

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