The ornamental design for a fluid pumpassembly, as shown.
FIG. 1 is a perspective view of the fluid pump assembly.
FIG. 2 is a front view of the fluid pump assembly.
FIG. 3 is a back view of the fluid pump assembly.
FIG. 4 is a left side view of the fluid pump assembly.
FIG. 5 is a right side view of the fluid pump assembly.
FIG. 6 is a top view of the fluid pump assembly; and,
FIG. 7 is a bottom view of the fluid pump assembly.
Features illustrated with dashed lines are not considered features of the invention being claimed, but rather illustrate an exemplary environment for the claimed features illustrated with solid lines.