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So I am new to the site, read quite a bit about similar issues and tried a lot of others suggestions, here's my particular problem, please help!!! Been at this over a year... It started with the lift pump failing, not a big deal, 300,000+ miles... so I put a fass 160gph titanium edition lift pump in, started and ran better than it ever had, too good to be true, drove up the street and back, bout 2 miles or so, and it died pulling in the driveway, Cracked the injector line and had a very weak flow... Now please make note when the original vp died, it didn't throw any codes, just mechanically died, went through thoroughbred diesel and got the one that has brand new electronics.. Anyway, I got it in there, bled all the lines, now I had amazing flow at the injectors, and started cranking, nothing... no pops clack or anything, I then realized the check engine light was staying on, pulled the code, and got 1688, and 1689. I do understand what these codes mean, being that they weren't present when the old one died, I figured it was the new pump had bad electronics, as it was the only thing that was changed and worked fine before. So I talked to thoroughbred, and they insisted it was in no way possible that it was the new vp, and with the information I gave them they recommended flashing the software to see if it would correct the communication issue, no such luck, and after doing some more of their tests they concluded with me that it was a bad ecm, well, several hundred dollars later, new ecm, to the dealership to have it flashed, and nothin... Two more things to note, when I installed the vp I also lost the lift pump feed from the computer, and also it will start and run with the cummins vp test box.. I've checked several though probably not all the grounds and the voltage at the pump, also several other things, if you would like to know something in particular please ask, I will go look at it and post the answers back as soon as I see the post, it's my only job at the moment and have a lot of free time Lol not to complain unnecessarily, but I've had the truck here for over a year and have had multiple other mechanics looking at it, been on countless sites and on the phone for days collectively.. so any help is much appreciated Thank you P.s. it's a 2000, 2500 extra cab, sticker date is 12/99, I know they had a change in there somewhere, just figured finite information never hurts lol