A fluid inlet/outlet manifold for a lubrication system comprises inlet and outlet passages, and a vent valve. The outlet passage fluidly connects a lubricant reservoir to a lubricant work line. The inlet passage fluidly connects a inlet to the lubricant reservoir. The vent valve is actuatable between a first state fluidly isolating the inlet passage from the outlet passage, and a second state that fluidly connects the inlet passage to the outlet passage, thereby permitting lubricant in the lubricant work line to be vented into the lubricant reservoir.