"
how come this new stuff is so sensitive to things...?"
One of the reasons I started this thread in this Owning/Operating forum was to share my
article and raise the level of awareness of the importance of ULSD fuel quality in modern HPCR direct injection diesel engines. These new diesel engines utilize technology far, far advanced from that used even 10 years ago. When you notice a leak, you check it with safety glasses, gloves and a 2-3 foot strip of cardboard because the pump pressure is so high (20,000 - 30,000 psi) that an invisible leak can inject a load of diesel fuel deep into your skin before you even realize it. The pump pistons & fuel injector nozzles are high-precision parts; the pump pistons are so precise that they can't be held by hand for measuring because the heat from a human hand will significantly affect the measurement! In terms of the fuel and emissions systems, these HPRC engines share little in common with older diesels and that includes the fuel: ULSD.