Strange noise from hpfp???

[jwr1527]

Ive searched all around and found nothing that describes my problem so im starting this hopefully to get some insight. We have a 2008 f250 with just over 100k at work and today it came in with a wierd noise under the hood. The noise sounds like a bearing in an idler pulley is goin out but its not that. Its coming from the back drivers side of the engine and it almost sounds like its from the turbo but i got out my long screwdriver to use as a stethescope and narrowed the noise down to the fuel line coming off the cooler next to the reservoir, it runs down next to the turbo into a T fitting which i think is the return line, one line heads up front the the filter bowl, and the other heads under the turbo and to the hpfp i believe. When i put the screwdriver right on that T fitting the noise is very noticably louder. Could the hpfp be making this noise, and from what i can hear through the screwdriver the noise gets faster as the rpms go up. I dont know a whole lot about these 6.4s so any help would be appreciated. Thanks, JIm

[jwr1527]

EDIT: I found this diagram and the T im talking about is the one on the back right that goes to the hpfp and up to the front of the head. dont know if that will help or not.
http://www.motorcraftservice.com/vdi...ply_System.pdf

[jwr1527]

Anyone have any idea about this. I'm leaning towards hpfp because I noticed this morning that there is a very slight miss at about 1000rpms but I really don't know for sure so any help would be appreciated

[blueoval95]

Did you ever find the problem. Mine is doing the same thing.

[jwr1527]

Ended up taking it to ford and they agreed with me that it was the hpfp. Boss didnt want to fix it at the time so the driver has steady been using it with no problems but they are gonna bring it back in soon so I can replace the pump. When ford does it they say they have to replace pump, injectors, lines and all which is a very expensive job so we are just gonna replace the pump by itself. Hope that helps and if you have any questions let me know.