The exclusive Attwood Fuel Demand Valve ensures pressurized fuel does not reach the engine, preventing engine flooding and fuel spillage. New EPA portable fuel tanks are required to remain sealed up to a minimum of 5psi. The Attwood Fuel Demand Valve prevents pressurized fuel from flooding the engine. The valve provides fuel to the engine only when demanded by the engine during start up or engine operation. Designed in partnership with OEM engine manufacturers, the Attwood Fuel Demand Valve is compatible with all OEM engine brands and helps to ensure proper engine start up and function.• Prevents engine flooding due to pressurized fuel• Allows only the amount of fuel requested by the engine• Prevents a pressurized "slug" of fuel from reaching engine• Made of high-strength composite material• Compatible with 3/8" and 5/16" fuel hose• Installs between the fuel tank and the primer bulb• Low vacuum restriction helps ensure proper engine function during startup and engine operation• 20psi max nominal input pressure• Protected for 40psi pressure spike• Built-in manual override• Compatible with ethanol-blended fuels• Compatible with all OEM brand engines (up to 350 hp) Made of high-strength composite material Compatible with 3/8"" & 5/16"" fuel hose Compatible with all OEM brand engines up to 350 hp | Attwood 9300FDV7 Fuel Demand Valve