Technician assured me yesterday when I picked the truck up the feul system was clean ie no rust, no water and yes I use a feul additive about evry 2nd or 3rd tank ie weekly.The issue is Ford no longer makes HPFP's for the 6.4. I asked for the old pump yesterday and they said there is a $150 core charge and I said WTF, you put remanufactured pumps on these trcuks they said YES. So you pay $1000 for a rebuilt pump so buyer beware. Techinician said they are replacing 3-4 per week in Tomball Texas and the average life expectancy of the rebuilt units is about 60,000 miles. some Tech's can replace it by removng the transmission but most remove the cab since the labor is already included in th eprice for cab removal. BTW yesterday when I walked through the shop to talk to him, there were 4 F250's with Cabs off in the shop. Love my truck but unfortunately it will be time for me to move on in the next few months based on the Tech's recommendation and buy something else.