Chev, GMC Trucks 6.2L, 6.6L Diesel Engine (Fuel/Water Separator w/Drain (12 Micron) (If base needed for this filter, use 24309) - can be used w/ diesel or gasoline - can use this filter along with base 24309 to convert cartridge fuel filters to the convenience of a spin-on or to add increased capacity and water removal capability to your existing fuel system