Fuel system

The present invention provides, a fuel system comprising a fuel-delivery control unit including a valve mount adapted to be coupled to and interconnect a fuel tank and a fuel tank filler neck, the valve mount being formed to include a fuel-delivery channel arranged to conduct liquid fuel and fuel vapor between an interior region formed in the fuel tank and a passageway formed in the fuel tank filler neck, the fuel-delivery control unit further including an inlet check valve positioned to lie in the fuel-delivery channel and configured to regulate flow of liquid fuel through the fuel-delivery channel between the fuel tank and the fuel tank filler neck, wherein the valve mount includes a shell made of a weldable plastics material and a fuel-vapor blockade insert encapsulated in the shell and made of a material that is impermeable to flow of fuel vapor.