US Patent 7086390 Integrated fuel tank and vapor containment system

A fuel tank for an engine that includes an air cleaner assembly and an air-fuel mixing device. The fuel tank includes a first tank portion, a second tank portion connected to the first tank portion to define a fuel chamber, and a canister at least partially formed as part of the first tank portion. A first flow path is at least partially formed as part of the first tank portion. The first flow path provides fluid communication between the fuel chamber and the canister. A second flow path is at least partially formed as part of the first tank portion to provide fluid communication between the canister and at least one of the air-fuel mixing device and the air cleaner assembly.