New fuel pump buzzing noise
I installed a new Delphi fuel pump assembly, AC Delco fuel filter, and Delphi fuel pressure regulator this past Friday and now I have a buzzing sound that comes from the pump and travels up the fuel line to the fuel pressure regulator. The truck idles and accelerates fine with no hesitation what so ever. I had replaced the fuel pressure regulator in October with an Autozone one and it made the same sound with the old pump, but went away after driving from NC to AZ. Is it possible there is air in the system or is this a noise I have to live with? Thanks for any help in advance.
Update-New fuel pump/system buzzing
I finally had a chance to get the bed off my truck and recheck all the work I previously done. Everything checked out good except for the buzzing noise. I traced to the return line and it I can feel it vibrate from the fuel rail all the way back to the tank. I put my ear on top of the pump and it is not the pump. When I take the vacuum line off the fpr, it doesn't make the sound. It is a brand new Delphi fpr. Do you think I might have gotten a faulty fpr or could it be a possible restricted line?