Okay, so I grabbed a fuel pressure tester and followed the testing procedure above and in the Haynes manual for my car. I also got the pressure specs for my specific car and this is what I got:
1. Pressure when the engine is off but the key is set to run I get a spike to 60 psi then a gradual drop and stabilized pressure at around 50 on my first run and 56 on my second run which is within the specs for my car. (Specs are 50-94 with engine off)
2. After trying the test with the engine off, I checked pressure with the key off which my Haynes manual states I shouldn't see more than a 5 psi drop after 1 minute. (Which I did not see. I seen a drop of about 3-4 after 2 minutes and it stopped dropping.)
3. I tested pressure with engine idle and got a consistent 58 psi which is good according to the Haynes manual (43-58 psi is the specs). I still heard the pressure release but did not see any change at all in fuel pressure
However, I did buy an automotive stethoscope and tested around on the top left of the engine where I am hearing the sound. I tested injectors, around fuel rail and not the sound. But I am hearing it faintly through the throttle body and it gets more prominent when it touch the black hose/line in the attached photo circled in red. Any ideas?
Image (Click to make bigger)
Sunday, June 28th, 2020 AT 12:46 PM