Which component is used to drain water from the system?

• A. Water drain valve
• B. Air eliminator
• C. Filter element
• D. Go-no-go fuse

Answer: (A)

Water buildup settles at the bottom of the fuel-separation or filter housing, and you remove it with a valve designed for draining. The water drain valve is located at the bottom of the housing and is opened to let the accumulated water (which is heavier than fuel) flow out into a containment container. Once the water has drained and fuel starts to come through, you close the valve to seal the system again. This keeps the fuel free of free-standing water, which can cause corrosion, microbial growth, and other problems. The other components serve different roles: an air eliminator vents trapped air to prevent air locks, a filter element removes particulates from the fuel, and a go-no-go fuse is an electrical safety device and not used for draining water.