We claim the ornamental design for the front manifold lever, as shown and described.
FIG. 1 is a front view of a front manifold lever in accordance with the present design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is one front perspective view thereof; and,
FIG. 8 is another front perspective view thereof, showing lever in a different orientation.
The broken lines in the figures are for the purpose of illustrating environment and form no part of the claimed design. The dash-dot lines in the figures are for the purpose of showing boundaries of the design and form no part of the claimed design.