So I'm putting some gauges in and wanted to make sure I have the best locations to install "T" adapters/fittings before I start cutting lines. I'm not a trained mechanic, but am ready to get dirty, so I will ask for advice before I make an ass of myself going in without any knowledge.
I have a fuel pressure and a boost gauge going in so I will need to tap the high pressure fuel line as well as a boost/vacuum line in order to install the "T"s.
Here are my thoughts and I want to be corrected if I'm wrong.
- Tap the vacuum line coming off of the BPV for the boost
- Tap the high pressure (delivery) fuel line right before the fuel rail
I've heard that another location for the vacuum "T" is on the line coming out of the waste gate, but I've seen a factory STI boost gauge (2005ish) with the "T" location off of the BPV. I figure if the factory put it there on previous model years then it should be a good location on mine.
Now with the fuel "T"...I ordered a 3/8" fuel pressure gauge adapter from Jeg's. I searched and searched online to find various sizes, but all I could find was 3/8" and 1/2". Now I know the 1/2" is way to large, but I'm not sure if the 3/8" is the exact size I need (I have not cut into the fuel line yet to check for accuracy). The adapter is a standard barb fitting type with hose clamps.
My 4 questions now are about the location and the size of the adapter.
1) Is the example in the picture below the correct/best spot to cut into the line to add the adapter?
2) If the adapter ID is a little larger/smaller than the current fuel line will it cause any issues or am I good to go?
3) If it's not the right size, then does anyone have any suggestions on where to get adapters that will fit this car as well as the 1/8" NPT sensor for the gauge?
4) If it's not the right spot, then where should it go?
Any help here would be appreciated. I'd love to learn and do this myself and not have to take it to the shop for the install.
If I can get the right answers, look for a DIY write up!
You'll have to do a horizontal scroll to see the right side of the image below...
