A fluid suction system for a retort having a vessel with a vessel length, pooled fluid at a bottom of the vessel defining a fluid surface level, and an outlet placing the vessel in fluid communication with a pump includes an elongated manifold for placement along the bottom of the vessel in fluid communication with the outlet. The pooled fluid flows into and through the manifold when the pooled fluid is suctioned by the pump, and the fluid surface level of the pooled fluid remains substantially even along at least a portion of the vessel length as the pooled fluid is suctioned by the pump.
