s5 TII fuel pressure question

[FRED]

An idling engine should read about 28-32 psi, sorta what you saw in your LAST picture above. So that seems to indicate the FPR is doing its job to me anyway.

So the question is...............did you ever check the fuel pump pressure by dead heading the line from the fuel pump/filte to the gauge????????????? I guess not or you'd have said so. So maybe you could do that for us? Just remove the line off the filter and shove it into the fuel pressure gauge and turn the pump on and the pressure you see is??????????????????

Maybe the fuel pressure of the pump is overwhelming the FPR???? Only way to tell is to look at the fuel pump pressure.

About your FPR source of vacuum. It tees into three lines. Where is that third line going?????????