Humming Noise With Key Turn On

[rgreen]

(01-19-2017 )Rawze Wrote:  

(01-18-2017 )rgreen Wrote:  After I start my truck isx 871 prostar and cut the truck off and turn the key on. I can hear aloud buzzing or wining noise, it seem to become from IFMS but I am not for sure t. I have replace the gear pump about 3 weeks ago... Thank you in advance for your input!!!!!!

That would highly depend on what you are hearing.

Here is what a healthy electric fuel pump sounds like on a CM871. it is at 1:21 in the video...

Thank Rawze that how mine sound.