How To: Install 04-07 STI Fuel Pressure Regulator (FPR) and Use a New Vacuum Source

[Mr. Electric Wizard]

I am planning to do this mod at some point but I cannot seem to locate any good vacuum port plugs that folks say are acceptable.  I'd rather not plug the manifold port with a rubber one that will only start leaking.

Are there any vacuum port plugs that are acceptable? Considering just using some vacuum hose, a bolt with silicone and a zip tie.

And what exactly is the function of the Doorman Fuel Line Connectors (800-120) and how do you use them?  Is my red arrow pointing to one of the Doorman connectors?

Edited September 19, 2023 by Mr. Electric Wizard

[Mr. Electric Wizard]

Bumpity bump. 

Edited September 19, 2023 by Mr. Electric Wizard

[GearJamr]

If you use some of the vacuum hose you cut adapting to the BOV location, you can easily use that to plug the port.  I made an aluminum plug to fit the end of the hose, zip tied that in for good measure, then zip tied to the port.  Granted I'm a machinist so it's easier for me to make a plug like that, but a bolt or screw would work fine.

[Infosecdad]

I just used a rubber cap with a ziptie and replace it annually before it breaks down and leaks.

[Mr. Electric Wizard]

Can either of you answer my question about the Doorman Fuel Line Connectors (800-120) and their use?

[GearJamr]

The OP in his walkthru used the fuel connectors because he cut new fuel lines.  You can just use the lines that are there.  Using new fuel line with new connectors will allow making the lines the correct length to avoid introducing more issues rather than correcting the stumbling issue.

[Mr. Electric Wizard]

Are those connectors showing in this picture?

The best I can tell, everything in there is a barbed connection, except for the stock connections.

Fuel injection clamps sure, but I don't see the other connectors mentioned in the list of items to do the install.

[GearJamr]

The connectors are the ones from the flexible fuel line to the hard fuel lines.  Again, if you don't touch the flexible lines, then the Dorman connectors are moot.

Go and read page 1, the OP goes over this exact thing.

[Mr. Electric Wizard]

Okay, this makes sense.  It seems that nobody has had to use these Doorman connectors.  But just so I'm aware, these would be used to connect a new (non stock) flexible rubber fuel injection hose to the stock hard lines?

[covertrussian]

Updated the first post and clarified that the Dorman connectors are optional.  Also fixed the image embedding

[BoozeRS05]

I’m looking forward to doing all this stuff too once I gather parts. Much appreciated on the write up 

[Mr. Electric Wizard]

4 hours ago, BoozeRS05 said:

I’m looking forward to doing all this stuff too once I gather parts. Much appreciated on the write up 

I second this!  Thanks SOOOO MUCH for the write-up!  It's awesome!

[Mr. Electric Wizard]

4 hours ago, covertrussian said:

Updated the first post and clarified that the Dorman connectors are optional.  Also fixed the image embedding

You are so generous to put this guide up.  This stutter has gotten pretty annoying.

[covertrussian]

Glad to help, this was one of my favorite cars to build AND DRIVE, so had to share the love :).

 

Now I will also say that having the fuel filter so close to the fuel rail might have doubled as a damper.  Also tune has a lot to do with it too, this car's tune is some of the worst factory tunes I've ever dealt with.