ATTWOOD®FUEL LINE KITS - MERCURY w/FUEL DEMAND VALVEEthanol compatible. Includes EPA certified Attwood® Fuel Line Primer Bulb & Fuel Demand Valve. Demand valve allows fuel flow automatically on demand. Fuel Demand Valve prevents engine flooding due to pressurized fuel. Bulbs are designed for the harsh marine environment. Dimensions: 3/8"x6'.