This fuel Modules fits the following Chevy/GMC applications (please check Engine Code to correctly identify): - 1997/1998 4.3L 6cyl Engine Code (W) M.P.I. w/OBD II stamped (GAV,GDJ or GFK) - 1998/1999 5.0L 8cyl Engine Code (M) M.P.I. w/OBD II - 1998/1999 5.7L 8cyl Engine Code (R) M.P.I. w/OBD II - 1998/1999 7.4L 8cyl Engine Code (J) M.P.I. w/OBD II stamped (GAV,GDJ or GFK) - 2000 5.7L 8cyl Engine Code (R) M.P.I. w/OBD II (Calif.) stamped (GAV,GDJ or GFK) - 2000 7.4L 8cyl Engine Code (J) M.P.I. w/OBD II (Calif.) stamped (GAV,GDJ or GFK) ***When replacing the fuel pump harness connector be sure to remove as much of the old wiring as possible. For example, if the connector had a poor connection this would create a resistance problem resulting in heat. This excessive heat melts the wiring insulation allowing moisture to enter and corrode the wiring, resulting in future problems. ***