I took in my 2021 ram longhorn eco-diesel this week after it started to lose power and misfire. I was told that the fuel in the tank was contaminated, but not sure with what. I put fuel in this week from our own tank that we fill numerous trucks and other equipment With every day and also I filled DEF the same day. They have told me that the fuel system parts need to be changed to the tune of about $9000. I don’t understand how the fuel could have been contaminated. I filled it myself and from a reliable source. Any ideas?