Chasing vacuum leaks and goes no where

[theWalkinator]

Originally Posted by JFP in PA

Time for a smoke test …..

I have smoke tested many times and found no leaks, I smoke tested from the intake tube right after the MAF. Do you think I should smoke test from second air pump charging hose?

Okay now I got new fuel pressure test kit and it works this time, it is 1/4" fitting.

Here is the fuel pressure:

Static: 2.8 ~ 3 bar
Idle: 3.3 bar

So fuel pressure at idle is good, but static is low, when turn the key to ON position, it went up to 4 bar then dropped back to 3 bar, after couple of minutes, it dropped to 2.4 bar.

So what gives? Fuel pump is leaking?