Exhaust Emissions System - EVAP: Description
Fuel evaporation system is designed to prevent the escape of fuel vapors into the atmosphere. System consists of fuel tank, a fuel filler neck adapted to unleaded fuel delivery nozzles, and a non-vented filler cap. A two-way check valve, an activated charcoal canister, a vapor/liquid separator (part of two-way check valve) and connecting hoses complete system.
The R-5 is equipped with a check ball in fuel pump return line. The 1974 models also have an expansion tank, a control valve (built into the carburetor float chamber), and a series of ventilation lines which are used to connect the various components.