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Message: [QUOTE="s8v4o, post: 1432464, member: 27015"] A little background information first. Truck is a 2011 with 70,000 miles on it. Truck is regularly maintained with oil changes at 7500 intervals with Rotella 5W-40 and fuel filter changes every other oil change. Last oil and fuel filter change was roughly 500-700 miles ago. The last oil change I put in Archoil oil additive and some of the fuel additive as well. Before that I've been using DieselKleen for the last 3000 miles or so. The truck has been on a diet for about 4000 miles now. Last night I went to get some pizza and noticed a weird noise coming from the engine. I know noises are hard to determine where they are coming from but it almost seems like it might be from the HPFP. It almost sound like a rod knock or something but I'm hoping it's not. I will go home with a stethoscope tonight to try to pinpoint the noise a little better. I've tried to do some reading but all that I seem to find are catastrophic failures. Does anybody know of the pump slowly going out? Is it possible that the Archoil is stopping it from being a catastrophic failure? I started it this morning and the noise wasn't there at first. Once the engine started to warm up the noise came back again. Not sure if it is related but I noticed shortly after starting the engine that the top radiator hose was collapsed. It was hard to even notice because of the foil cover it has over it. As the engine started to warm up it was starting to expand. I have two videos where you can definitely hear the noise. The first video is of me over the engine some and some with me under the engine. The second video is with the phone just over the drivers side tire. Any help or information is greatly appreciated. I have no problems trying to troubleshoot this if I have a little guidance. To date I've already had to replace evap core, change coolant seal at the turbo, and do the full diet all by myself so I'm not afraid of getting my hands dirty. If it turns out being the pump I'll be talking that by myself as well. Here are the videos. I wasn't sure how to embed them so here are the links. EDIT - In the first video it's way more audible from under the video which is the 2nd half. The bottom video is pretty easy to hear as well. [URL="http://vid195.photobucket.com/albums/z7/s8v4o/2011%20F250%20Super%20Duty/12211606541_zpsbqxvewlz.mp4"]http://vid195.photobucket.com/albums/z7/s8v4o/2011%20F250%20Super%20Duty/12211606541_zpsbqxvewlz.mp4[/URL] [URL="http://vid195.photobucket.com/albums/z7/s8v4o/2011%20F250%20Super%20Duty/12211606561_zpsrsn5yxyv.mp4"]http://vid195.photobucket.com/albums/z7/s8v4o/2011%20F250%20Super%20Duty/12211606561_zpsrsn5yxyv.mp4[/URL] [/QUOTE]