Anyone know what line to tap. Have 04sti looks like theres a blue and yellow? hard lines. And what size tee to install.

 

You want to put the sensor in the feed line after the rails.

I am not sure what you refer to when you saud blue and yello.

 

Found out what size fuel line its 5/16. And i believe its the bottom most fuel line.

 

?

 

From what I know, it needs to be between the fuel filter and the FPR. If you're still on stock rails, the FPR is at the end of the rail for cyl 1 and 3. Which means you'll have to tap the feed line that is coming out of the filter and going into the rail (should be the very top line). On the wrx it had a GREEN mark on it, but I'm not sure on the STi.

 

Sti has no fuel filter in engine compartment. But its the top most hard line on the manifold. To test unhook and turn vehicle on really fast dont start. If fuel is heading towards engine its the right one. Anyone know stock fuel pressure. It seems to rise with boost. Boost dependent?

 

FP is boost dependent, but the static FP at idle is 43.5psi


edit : oops, on the wrong SN...