Ok, I've just started hearing two new noises, and one I think is related to the fuel pressure gauge, but not sure. One of them I am getting sounds like a power steering pump whine when it's idling. I can hear it get a little louder/higher pitched when I rev it, but goes away, or just can't hear it after about 1200 rpms. Any idea's what to check? Also, I am getting a buzzing/hissing type sound from about 1500-2000. It's much more noticable when I hold it at about 1700 and when I down shift. It almost sounds like the fuel pressure isolator pulsing. Anyone else have that?

 

I have the exact same noise, i mean exact. I also just installed a fuel pressure guage with an isolater, how did you install yours and where. Wonder if that could be the problem then. I was going to take it in to the shop tommorow, but i guess not if its the fuel pressure guage. Any help would be nice

 

Mine is tapped into the pump. I think I'm going to move it to the bottom of the fuel filter though. See if that helps. I'll post back here and let ya know, but it might be a few days because it's been rainin here and I don't have much of a covered area to work right now.