Which component removes water from fuel in a marine fuel oil filtration and separation system?

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Water in fuel must be removed to prevent corrosion, microbial growth, and injector problems. The component that does this in a marine fuel oil filtration and separation system is the separator or coalescer. A separator uses centrifugal forces to exploit the density difference between water and fuel, driving the heavier water out to a drain while the lighter fuel continues on. A coalescer helps when water is present as tiny droplets by making them collide and merge into larger droplets, which then separate more easily and can be drained away. After water is removed, the clean fuel moves on to further filtration or to the engine.

A fuel heater is used to raise fuel temperature to reduce viscosity and improve filtration, not to remove water. A purifier can also remove contaminants, but the primary water-removal stage in many marine systems is the separator or coalescer. The term water damper isn’t a standard component for water removal in this context.